Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f7cb6019050079…

MALICIOUS

PDF

41.5 KB Created: 2020-08-06 12:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7bbc39253a8f7c1bb2aaf575163224f SHA-1: b7bab3bc6a9220e0b4f45d309cb9a3f0604de28e SHA-256: 01f7cb60190500797c360bc8b4f0936f230b74af57058debab5cb00a14c6992e
194 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 a redirector known for malicious activity. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that is also present in the embedded link farm, suggesting a coordinated effort to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=contrato+de+arrendamiento+concepto+pdf
    • http://files.thecurlingfamily.com/uploads/1/3/1/4/131483336/3eb83a7ff.pdf
    • http://files.nmartisancakes.com/uploads/1/3/1/3/131383727/sasimurikumalow-joxevunegudexa-zifetonute-dororupulij.pdf
    • http://files.bysophschnei.com/uploads/1/3/0/8/130814754/purutoxezebujat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/67367764362.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/character_count_with_spaces.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/jesaper.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/sasekagenesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/aa_speaker_tapes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/42315617421.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/wojirij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/penaxofibulupowedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/23013177996.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/wewepuwofodokivekewevam.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/35150820258.pdf
    • https://cdn.shopify.com/s/files/1/0435/4696/8218/files/dekusifaseradofakujuwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/24239599626.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f6.bin
e6abfd5379de310bd4db8b43ee8fcd798cbc4d8f414e61e713308323c36436d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F6 4996 bytes
font_01_sfnt_off000074e1.bin
ff55d953b2d8a1fcb1b5757ce59be67c4a086bffafd317f05877f94611c0f0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E1 10956 bytes

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