Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3ae7151770bd29…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 18:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 664af3453b9f47a2c80f8190eec72e25 SHA-1: d030b59bfb5c820ed77981013dc99ad62e6a8a1d SHA-256: 0e3ae7151770bd29f61f2e36a9d0b11f2668032fb56f18ce0f728a179b7ea217
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm or SEO manipulation scheme. The ML classifier also strongly indicated maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=isotopes+worksheet+answer+key
    • http://files.morrissuperherorun.org/uploads/1/3/0/8/130813516/6465846.pdf
    • http://somudupu.timbstechtalk.com/uploads/1/3/1/4/131407117/5439c4.pdf
    • http://files.tamsro.com/uploads/1/3/1/4/131438718/e7131be144e59.pdf
    • http://files.my-composure.com/uploads/1/3/1/3/131379014/6ba33f26c8.pdf
    • http://files.foundationsofadolescentministry.com/uploads/1/3/0/8/130813134/nukipu_joraxuvu_kepiz_kefibidibopuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8462/7614/files/podumuxamukopokaperikex.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/nerodetupexi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/74151294806.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/18279556128.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/69129577959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/kujakelubuxabifakat.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/pivilaxitoniniz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/63849443042.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/45852098919.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_off00006614.bin
1f1975d3d08ebeedfd7ef2444a92af39f0b694557b8c90190b9128ecfd4e49db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6614 5072 bytes
font_01_sfnt_off00007761.bin
a646832b3be9e2f2a9c6a06e376ac7db82258231ca7314661a1eb6931baa10cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 10376 bytes

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