Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5b1e8812b987fe…

MALICIOUS

PDF

44.8 KB Created: 2020-08-04 00:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d329532b5e79cb7131853b4a6936665 SHA-1: f814ab4c184f769a157d8d8f567605c279018794 SHA-256: 7c5b1e8812b987fec80195cb128d4c00b65a3588e2584baf410c5b89c12b9bb6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary URL `https://ttraff.ru/pify?keyword=pengantar+akuntansi+manajemen+pdf` identified as a malicious redirector. The document body, though heavily obfuscated, contains references to accounting and the authoring application, suggesting a lure to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used for phishing or to deliver further malicious content.

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=pengantar+akuntansi+manajemen+pdf
    • http://files.maxhamhypnosis.com/uploads/1/3/1/0/131071137/3837161.pdf
    • http://files.originalsexyslave.com/uploads/1/3/0/9/130969004/ca2abe.pdf
    • http://files.scsa-pa.org/uploads/1/3/2/3/132302921/dikiletelelo.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/37383948944.pdf
    • https://cdn.shopify.com/s/files/1/0437/8371/7015/files/pixafiposobigareluzanezu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/wild_arms_3_walkthrought.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/gagozoroxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/reriraj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/62834756095.pdf
    • https://cdn.shopify.com/s/files/1/0439/0102/6459/files/80538686530.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/juzesalepijiketelufufudes.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/somipetim.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/old_ncert_biology_book_class_12_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/abacus_mental_math.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/pavlov_media_channel_listing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000689b.bin
8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689B 1684 bytes
font_01_sfnt_off000070ff.bin
bbb01cccd69cb48f2b0abe5b7598355d3b99260a03efe2d32249940bc4cf3339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FF 5472 bytes
font_02_sfnt_off00008390.bin
db84793f888251fa25ed5dd347d95741ba575dea5cd797d5d9f976ff416f1414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8390 10012 bytes

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