Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd7583cfc3c7a58…

MALICIOUS

PDF

39.9 KB Created: 2020-08-10 21:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c1344817823b211928dfa825241ad4 SHA-1: 7563a58959ce633cb6ae00922eeb11c1c244a7d2 SHA-256: 0cd7583cfc3c7a5834a65c91e967a79be9b1dacfab9c20fb4794d9345919ef1c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for downloading a PDF. The presence of a link farm and a malicious redirector strongly suggests an attempt to lead users to malicious content or phishing sites.

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=effective+technical+communication+pdf+download
    • http://files.fctnbombers.com/uploads/1/3/0/8/130814115/nevogojofamuwatuwage.pdf
    • http://files.seattleudancemarathon.org/uploads/1/3/1/4/131437276/virevemirepub_kumidibuzidofob.pdf
    • http://files.seattleapartmentfinders.com/uploads/1/3/1/1/131164310/5254124.pdf
    • http://files.holistichealthdiy.com/uploads/1/3/0/7/130776055/lewex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/ice_candy_man_novel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3824/3996/files/pdf_file_test_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/10262691234.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/4196100160.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0257/files/tizagigutezenopogegozoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/71865908575.pdf
    • https://cdn.shopify.com/s/files/1/0434/9617/7816/files/audi_q7_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0451/6803/3946/files/10_flat_belly_diet_smoothies_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/30319567480.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0550/files/acls_bradycardia_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/63847119945.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/62203241908.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_off00005ccc.bin
6258ba37a3219382e1b606002f0b7fcdca25fb3155868e1141bd7b0d01c5d33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCC 5232 bytes
font_01_sfnt_off00006e88.bin
fe977cdc08d03aaf9240738ea41ec9f1d22230c2f0c54591bb86bd62bc022196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E88 10452 bytes

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