Malicious PDF — malware analysis report

Static analysis result for SHA-256 182b89556df9102c…

MALICIOUS

PDF

64.6 KB Created: 2020-08-12 20:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fed880051c7a798cf6acbbed5a84c5c SHA-1: 8341e6b8865d53cfd508359d6f178c33b7747763 SHA-256: 182b89556df9102c92a6c167caeb9bda7b4d8a7d1f9210d63f437ce8d6da0274
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a common tactic for link farms and SEO manipulation. One prominent URL, https://ttraff.ru/pify?keyword=artificial+intelligence+course+pdf+download, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of a free AI course download.

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=artificial+intelligence+course+pdf+download
    • http://files.ledgewoodhills.net/uploads/1/3/1/8/131856065/mixidato.pdf
    • http://files.preserveatspringknoll.com/uploads/1/3/1/3/131379040/5439033.pdf
    • http://files.proficiencyfirst.com/uploads/1/3/1/4/131406449/guvevumanonisel.pdf
    • http://files.jessirobertsonmft.com/uploads/1/3/1/3/131381363/c189c4ab9.pdf
    • http://files.silkroadresearchcenter.org/uploads/1/3/1/4/131438708/1bf520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/21208423690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/63438354276.pdf
    • https://cdn.shopify.com/s/files/1/0434/9585/0150/files/caso_clinico_anemia_sideroblastica.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/who_s_afraid_of_virginia_woolf_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/sipusexezo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/latuxamakivurikesu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/xogabulagatarewufajedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6165/8279/files/koputogil.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/dd_bronkopneumonia.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/importancia_de_tomar_agua.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/a_new_textbook_of_americanism.pdf
    • https://cdn.shopify.com/s/files/1/0438/7966/1736/files/ivy_tech_accuplacer.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/mesekolirakuporukira.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_off0000b66f.bin
e5a28bac45fd99780f35ef0174c559f763c210f0f6c107087599a7e928761f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 5404 bytes
font_01_sfnt_off0000c8e4.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 1800 bytes
font_02_sfnt_off0000d171.bin
96febc56b8a40f9b2be11ffcc43247044a73cc32c4e5e02043e07a2e130810ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 10360 bytes

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