Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1bc0e1819af2e2…

MALICIOUS

PDF

42.7 KB Created: 2020-08-22 11:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 216bbdc04dfafe285a343c878d359f6c SHA-1: b87c8bdf6a30a24179895e739f34f3fe1c8afbfe SHA-256: 5c1bc0e1819af2e202e715728dc6162a6aa961d6d91f6b8e9ba4592da8bc7b8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure. This suggests a phishing or scam attempt, likely using the 'FB auto liker android app' as a lure to drive traffic to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=fb+auto+liker+android+app
    • http://files.lauravallesconsulting.com/uploads/1/3/1/8/131871648/2800708.pdf
    • http://files.thebackpackleague.com/uploads/1/3/1/4/131437380/577a663.pdf
    • http://files.hellosquatch.com/uploads/1/3/2/7/132741556/4e22ecd63fef.pdf
    • http://soxusa.ccaromatherapy.com/uploads/1/3/2/8/132814930/rurutawodijula_moridurava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/4031/6319/files/46222790785.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/49243455871.pdf
    • https://cdn.shopify.com/s/files/1/0436/1263/5299/files/dnd_sorcerer_wild_magic.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8734/files/74085857785.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0101/files/sqlite_database_free_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/good_table_manners_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3735/9271/files/ielts_academic_writing_task_2_topics_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0449/2728/7451/files/canula_nasal_de_alto_flujo_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/35975252822.pdf
    • https://cdn.shopify.com/s/files/1/0434/8205/4813/files/autostoperski_vodic_kroz_galaksiju.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_off00005c50.bin
ce971aa061624479868b56e5e3cb23bfa2109fc695ca456e19dfd4f3a25b6a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C50 4816 bytes
font_01_sfnt_off00006cac.bin
37c43d58ceecf597524a1cac770c139ff45ba436effe62065261910b4fb0299d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAC 10360 bytes
font_02_sfnt_off00008fe5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE5 4324 bytes

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