Malicious PDF — malware analysis report

Static analysis result for SHA-256 e779bad5314684ac…

MALICIOUS

PDF

35.1 KB Created: 2020-08-08 04:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9cac8c56154e56e9579ad9624b862112 SHA-1: 60b2549978aa03dabdeece87772cafd6aa787a57 SHA-256: e779bad5314684ac329ef76485f6e3779091989c63254d73fd62b077c774a6ca
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a phishing or scam attempt.

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/pify?keyword=pesticide+bioassays+with+arthropods+pdf In PDF document text
    • http://files.orientation.fis.hk/uploads/1/3/1/6/131637484/pekezovofedojozonaw.pdfIn PDF document text
    • http://files.masjidfreehaven.org/uploads/1/3/0/8/130874067/7371706.pdfIn PDF document text
    • http://xadasux.greatdeerchase.org/uploads/1/3/1/6/131607163/3120784.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/1/0432/4789/4683/files/67013521979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/42389244895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7431/3622/files/lightning_frequency_arrester.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/sociology_book_by_anthony_giddens.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/58332044383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/dezajulimed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/raduzuzepufojanuzabirimuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/anemometer_digital.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/image_to_base64.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/kolupa.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_off00004bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC3 5544 bytes
SHA-256: 553f3df11f24081c8b142db9a3358f112be23587a94a343fe8bc3601f74556f2
font_01_sfnt_off00005ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA5 9724 bytes
SHA-256: 65fa203ebc443e547be9d41c01a0c0fd48bb49494558124ab91c78c1b22edc6f

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