Malicious PDF — malware analysis report

Static analysis result for SHA-256 3413e7125af4bcbd…

MALICIOUS

PDF

40.7 KB Created: 2020-08-09 22:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fff74dbd404b4bd182a1c3bb1fc534 SHA-1: dd6fd0aa2ba4dfe0f26617b29a0a609d165f2548 SHA-256: 3413e7125af4bcbde8785a29cd704b8e0e4fd736f401ceeb3500acde2e40311e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=pc+troubleshooting+beep+codes+pdf, which is flagged as malicious. The presence of numerous embedded links to external PDFs, many hosted on Shopify, suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. 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/pify?keyword=pc+troubleshooting+beep+codes+pdf
    • http://files.toplineeq.com/uploads/1/3/0/7/130776712/dawozudugotuw.pdf
    • http://files.projectpurityseeds.com/uploads/1/3/0/7/130739704/jidebanopimogas-detekub.pdf
    • http://files.covespeechtherapy.com/uploads/1/3/0/8/130814258/xapovalafozusuno.pdf
    • http://vuvezek.theraphaschool.com/uploads/1/3/1/4/131453060/6f6c4ac3a6e1411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/99763701001.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/18902122043.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/zutavewosip.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/kugoluzujariwixaxofite.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/53250679934.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/85283849500.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/13123891526.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/37752882215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovogosiwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/46004560602.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/wodisefikubereduzexogudo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/namonufor.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006229.bin
b6a094f56e640c8d2979bc6626f27be4b1c6d57a3d305f408a9eabc8e890aebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 5348 bytes
font_01_sfnt_off00007450.bin
27728d02e8dbe4b26b7b2199cb74a5cbcdf0d3dcc94729962443a0a59ee87bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7450 9748 bytes

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