Malicious PDF — malware analysis report

Static analysis result for SHA-256 3022dc52cc13da91…

MALICIOUS

PDF

79.5 KB Created: 2020-07-22 00:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 785ed97e06f4946c4b689089dbda3df1 SHA-1: ec8eba37ef83834070699e9148569e47eeea0278 SHA-256: 3022dc52cc13da914dee8f5e791840174d1e16c1937fb2209490b4ce28cba041
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure, specifically `ttraff.ru`. This suggests the document is designed to lead users to malicious sites under the guise of providing job interview resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=self%20introduction%20example%20for%20job%20interview%20pdf In PDF document text
    • http://files.blainsport.org/uploads/1/3/2/6/132682833/32a87627548c19.pdfIn PDF document text
    • http://files.llanfairps.com/uploads/1/3/1/1/131163890/3452510.pdfIn PDF document text
    • http://files.marlboroughsafetyforum.com/uploads/1/3/0/8/130813997/getoruvopel_sepesunura.pdfIn PDF document text
    • http://files.nelsonrealm.com/uploads/1/3/2/7/132710592/durijikunep-fobavorogoduman-nusujelali.pdfIn PDF document text
    • http://files.akapartyband.co.uk/uploads/1/3/0/7/130738850/jasokidixutisawizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/ruzasotevuruvivoxojife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/vexegadepudagamazolup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/81596492641.pdfIn PDF document text
    • https://xutifik.files.wordpress.com/2020/07/tuposotekaxuzixazumid.pdfIn PDF document text
    • https://guzubuxokom.files.wordpress.com/2020/07/giteme.pdfIn PDF document text
    • https://xevekebi.files.wordpress.com/2020/07/21290481856.pdfIn PDF document text
    • https://kavuduve.files.wordpress.com/2020/07/subekotav.pdfIn PDF document text
    • https://bosaletu.files.wordpress.com/2020/07/32666713507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/xegobivilubawuranodapaxod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/79894634426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/kabarujidakived.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/pitizuledawexizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/xibilimedubokafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/80754949158.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/sekas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 5544 bytes
SHA-256: b0385b478d8865d56cd64cc45ab9aac0e26283e6254cd9e3c6264c11cac356fa
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10484 bytes
SHA-256: 260d77d3e6958b777ff661cba45259b90cce41ad55d3444be3e6b04b908102e2