Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae7a8371bb49e77…

MALICIOUS

PDF

90.3 KB Created: 2020-08-02 20:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e65625db00c5811808385ecc3431336 SHA-1: c1bcfea7c2610a7cb7003c83f39cb54ccb8ef873 SHA-256: 7ae7a8371bb49e773833bf3c468585622400f321a87e1ac4f4ae4251f0c5bd59
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=discord+chat+font
    • http://files.bulacanhouselot.com/uploads/1/3/0/7/130775992/vopanapimina-palejav-wumawonezijuwo.pdf
    • http://files.stallaureas.com/uploads/1/3/1/6/131637896/8632563.pdf
    • http://files.kathleenhite.com/uploads/1/3/1/0/131070894/liwebofenobo-raravotajefamig-zawir.pdf
    • http://files.heritagehs.org/uploads/1/3/2/3/132303351/vojoviroverowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/20923861283.pdf
    • https://cdn.shopify.com/s/files/1/0440/9229/3272/files/67535209996.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/sixarapedujegadunejavuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4331/5102/files/6251987731.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/tukamovewipaberasitunewef.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/gezopawatapokadepize.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/42652309454.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/jigakival.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/52601767745.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/99_problems_and_messages_a_boogie_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/7298/6015/files/4735462149.pdf
    • https://cdn.shopify.com/s/files/1/0428/4642/1158/files/34954661816.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7d.bin
a922a4c2abeb5dc2532820f8c69f788b7a1a17729f3b139460a2c4bd6ed56fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 4748 bytes
font_01_sfnt_off00011c7c.bin
d9c528b9a9ebcd68a64896d6535235f283dc43f33713573980199df2f42e9cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 2612 bytes
font_02_sfnt_off000127dc.bin
951e13ee5735df947ec1bbe1b8e5251d1461a0a0e4e5bdc04679eee5684805bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 10864 bytes
font_03_sfnt_off00014cfc.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFC 4324 bytes

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