Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c65e1fad5d63da…

MALICIOUS

PDF

52.9 KB Created: 2020-08-07 07:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 206e55e0a64072579a7e4e9409737403 SHA-1: 888ef63d54747452c402646c7ea2b6839adcb897 SHA-256: a5c65e1fad5d63da2a909c89079ecf450b71f21e8479ae6b83a5faad8b348b8c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects through ttraff.cc, a known malicious redirector. This indicates a phishing or malware distribution attempt. The document body, though garbled, contains text related to a PDF and a URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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=business+vocabulary+in+use+advanced+2020+pdf
    • http://files.dalessandroscouting.com/uploads/1/3/1/4/131408581/3537013.pdf
    • http://files.eudaimoniatravelblog.com/uploads/1/3/1/3/131380592/wimajuxewig.pdf
    • http://files.gcctraining.net/uploads/1/3/1/8/131858287/posanosit.pdf
    • http://files.luckyyoutattoo.net/uploads/1/3/1/8/131871721/pigopiriroditup_duvepi_xolukiwupe_sitiwajaf.pdf
    • http://files.mclactation.com/uploads/1/3/0/7/130775413/03c64.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/9588257138.pdf
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/best_mmorpgs_of_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/pekuposoporoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/aptitude_test_questions_and_answers_with_solutions_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifizazuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/kusixinir.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/dibisalik.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/git_pull_branch.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/getavisovavu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/46916534350.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3941/files/vitibexulusetekoxafifaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/8265693152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081b3.bin
d2d982f6a1bc74f767579b5fa760b414d1f6c022873f12b30ff479cf3c41750f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B3 5576 bytes
font_01_sfnt_off000094b0.bin
c0f25b5954703c63c8118afd5e65256db2ff4e9ddd264d78e307b37dd52b73b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B0 10212 bytes
font_02_sfnt_off0000b79f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 4324 bytes

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