Malicious PDF — malware analysis report

Static analysis result for SHA-256 b123c941e4c9e00b…

MALICIOUS

PDF

46.0 KB Created: 2020-07-08 20:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d278495bebd8ceab2398582e495ee19c SHA-1: 7524c30cb884688b119723990b589d41d150ad25 SHA-256: b123c941e4c9e00bff5977599cbabcb7d79aa43a2624ce10c70d97962248ceac
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded URLs, many of which point to external PDF files. One URL, 'https://ttraff.ru/wb?keyword=the%20clean%20eating%20cookbook%20and%20diet%20pdf', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, likely designed to drive traffic to malicious sites or distribute further malware. The ML classifier also strongly indicated maliciousness.

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=the%20clean%20eating%20cookbook%20and%20diet%20pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.papermagicbook.com/uploads/1/3/1/8/131860787/nelakojopotazedi.pdf
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdf
    • http://files.oakdalemma.com/uploads/1/3/1/3/131381802/3084622.pdf
    • http://files.shop-black-moon.com/uploads/1/3/1/4/131409055/wagazalesofo_newepavewerediz.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://files.wcrpla.org/uploads/1/3/1/8/131871533/ac9b792a77.pdf
    • http://files.alissaellisphd.com/uploads/1/3/1/4/131452827/844207.pdf
    • http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdf
    • https://jezovuri.files.wordpress.com/2020/06/67734023180.pdf
    • https://wabufalij.files.wordpress.com/2020/06/3658806303.pdf
    • https://budekukagok.files.wordpress.com/2020/07/41700378420.pdf
    • https://patepekugi.files.wordpress.com/2020/06/tokesesoxaso.pdf
    • https://ruxafuwa50564895.files.wordpress.com/2020/07/zenesoxasovorijiwupulaxun.pdf
    • https://worelelagep.files.wordpress.com/2020/07/32334523565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.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_off0000759d.bin
7c2d8c137a73bd4f184a5a0f0472dfaa7ba3ba907acd548294baa309343929c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759D 5084 bytes
font_01_sfnt_off000086db.bin
150b42eabfc8f83acce71cc2df558d2ca96826fbf1c621e43be52f97cc220743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DB 10684 bytes

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