Malicious PDF — malware analysis report

Static analysis result for SHA-256 20631dc5fa58b4e2…

MALICIOUS

PDF

54.5 KB Created: 2020-07-19 03:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4f6a3211e86b19ea3c736edc5358ea SHA-1: 226a796832b543f4d82acdfe18afdfcc02219921 SHA-256: 20631dc5fa58b4e2d014e861044b40af9bb403bd078ec25bf8a86677a0d486b9
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=ged%20prep%20test%20pdf
    • http://files.sherieunfiltered.com/uploads/1/3/2/8/132815961/a59b4b501cc8.pdf
    • http://files.arlordpac.ca/uploads/1/3/1/3/131383426/buzip_fitewewasalawes_dufufekelul_sekigibulumazi.pdf
    • http://files.zachpiercemusic.com/uploads/1/3/1/0/131070651/547ba.pdf
    • http://files.livingatthedistillery.com/uploads/1/3/0/7/130776591/dilunokewanubol-duvafopap-pijikofusejoji.pdf
    • http://files.northmetroweekday.com/uploads/1/3/1/8/131856954/bububawujitigudevup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/20344658637.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65294746239.pdf
    • https://sojukitibo.files.wordpress.com/2020/06/56035642429.pdf
    • https://wabuvodulix.files.wordpress.com/2020/07/61363676175.pdf
    • https://pevoruzon.files.wordpress.com/2020/06/buwusugexasisa.pdf
    • https://kemubebi.files.wordpress.com/2020/07/mapuzagageduwalis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/zitepevajuxumedirovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/zomisafatakomuzugadapezed.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/45506740684.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/84660393038.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sozolomunegodufedawugiwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/wogubupudinafef.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/linuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/vemasu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009954.bin
c43708be612e947e38cf4e39b838b39984ae8956064329183b56a9a029695125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9954 4348 bytes
font_01_sfnt_off0000a82f.bin
370f6702ad8e9400397ec4dd41f7885b8552d66e22930dff3dcbfd5d4f003b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA82F 10660 bytes

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