Malicious PDF — malware analysis report

Static analysis result for SHA-256 473817dc4e5fbae2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-11 21:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a532698d9c302834b15ecfda6d679a1 SHA-1: 54ace42d59c4059d54b35efab14041cf434b469a SHA-256: 473817dc4e5fbae28e4a188f6a4e555cfd2e01269f0350238c3850510ae00a18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with numerous embedded URLs, many pointing to benign Shopify domains, but one critical URL leads to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and a benign-looking PDF title, suggesting a lure to a malicious site.

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.cc/pify?keyword=hemangioma+hepatico+pdf+seram
    • http://files.sincerelyalana.org/uploads/1/3/1/6/131636766/zadebogonidavaluk.pdf
    • http://wumopix.leapsandboundspt.net/uploads/1/3/1/6/131606490/nasebog.pdf
    • http://files.bhsumath.com/uploads/1/3/1/3/131380604/xogasisaj-zatajabik-lopezor-nejijafeguriraj.pdf
    • http://files.ericcameronfilm.com/uploads/1/3/1/6/131606330/sijaxemilede-selip.pdf
    • http://files.pastorodc.com/uploads/1/3/1/4/131406507/mifuroxilimubi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/calculus_early_transcendentals_10th.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/71596517662.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8674/files/6385348134.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/85614191196.pdf
    • https://cdn.shopify.com/s/files/1/0435/7246/1727/files/poponikedufegifez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/gorazunigixologofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/44644468037.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/bsc_1st_year_zoology_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/gefasuzoligepumow.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/guwinux.pdf
    • https://cdn.shopify.com/s/files/1/0445/4242/7295/files/pesibozumelogaxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/76697539300.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_off0000691d.bin
6ca7b1e3ad3c428c9cc8554dee241c5cb1287348fa6eb346ce206dd86a41e3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691D 5500 bytes
font_01_sfnt_off00007ba0.bin
c3f7acd3025b4e08aa751e61361c7b9ff2c462e16ca763af7ba45b90e561133a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA0 10300 bytes

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