Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bc77ba6e528d5b…

MALICIOUS

PDF

41.4 KB Created: 2020-07-10 09:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 6fc4a38d4e318547f6117178c8a288c9 SHA-1: 66c40e23fc2074e1cb07e73068762f2f298ea9d7 SHA-256: e8bc77ba6e528d5ba4c9d1c659ac878e5ff9bac64bfb7ebde9673b23dfb4ed20
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to 'ttraff.ru', a known malicious redirector. The document body itself is minimal and appears to be filler text related to the topic of productivity and efficiency, likely to mask the malicious links. The primary attack pattern involves SEO spam and directing users to potentially malicious content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=difference%20between%20productivity%20and%20efficiency%20pdf In PDF document text
    • http://files.scentedgrove.com/uploads/1/3/0/7/130775364/736d015fa.pdfIn PDF document text
    • http://files.omegafinance.com.au/uploads/1/3/1/4/131453045/vemewa-vilatuz.pdfIn PDF document text
    • http://files.nanaikamalama.com/uploads/1/3/1/4/131407424/2325775.pdfIn PDF document text
    • http://files.diamondjleatheroftexas.com/uploads/1/3/1/3/131380720/gomagutexej_zudeva_fusurojuf.pdfIn PDF document text
    • http://files.latinforstudents.com/uploads/1/3/0/8/130814387/3024460.pdfIn PDF document text
    • http://files.breedingforthefuture.com/uploads/1/3/2/6/132681566/sutavumuz.pdfIn PDF document text
    • http://files.swoffordmd.com/uploads/1/3/0/8/130813557/dukodixago_puxamitego_jodipapipukiwix.pdfIn PDF document text
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdfIn PDF document text
    • http://files.instantcarappraisal.com/uploads/1/3/2/3/132302764/bumomexasugadag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zosalij.files.wordpress.com/2020/07/tovadaburodidaruke.pdfIn PDF document text
    • https://zadedow817229965.files.wordpress.com/2020/07/25076439368.pdfIn PDF document text
    • https://soxivili.files.wordpress.com/2020/07/787397293.pdfIn PDF document text
    • https://kotosidimof.files.wordpress.com/2020/07/28587669179.pdfIn PDF document text
    • https://bokisutedex.files.wordpress.com/2020/06/45897835480.pdfIn PDF document text
    • https://vikuriwugapo.files.wordpress.com/2020/06/22333653860.pdfIn PDF document text
    • https://defenim.files.wordpress.com/2020/07/74987976771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/romiket.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_off00006256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 5212 bytes
SHA-256: b2c51b3bf61d7f62930e852e01e85799f279fbdd192e91fc22921e8ab6d9055a
font_01_sfnt_off00007435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 10496 bytes
SHA-256: 1375a1f922db25c4acc2d6741cb7215e6130a4baa04d767080e1df705c70b590