Malicious PDF — malware analysis report

Static analysis result for SHA-256 13aba6aa7e89caa0…

MALICIOUS

PDF

76.3 KB Created: 2020-08-08 22:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88e8633e527b0c7e164b085c0d9e1482 SHA-1: 7d8008a3a6f8d2d9fe2e82440832f39716efaaa0 SHA-256: 13aba6aa7e89caa04207667925b1df1e83113ed82f8f0b74d2c8236fdaacf76c
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm, and one critical link to a known malicious redirector. The document body, though malformed, contains a URL that is also flagged as malicious. This suggests the document is designed to redirect users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oster+bread+machine+manual+pdf
    • http://semoteba.thepariseffect.net/uploads/1/3/1/0/131070420/jokopobab.pdf
    • http://files.knelstrom.com/uploads/1/3/0/7/130740211/kilesonupidiguwazeb.pdf
    • http://files.widhalmcustomhomes.com/uploads/1/3/0/9/130969436/matadix-jadipedutuliwek.pdf
    • http://files.drstackhouse.com/uploads/1/3/1/4/131406412/8611566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/6110752004.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/88844184435.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/bujamogufenelipofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/81893384845.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/28582247954.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/56648938869.pdf
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/avesta_holy_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/72267185035.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/kimimonunilumeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6608/files/final_fantasy_7_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/78663886594.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8919/files/efectos_adversos_de_los_aminoglucosidos.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bf8.bin
6550bab12ab1cc6d8d06ac004fec350a5605c005afdbbf5d360237eef934402b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 24840 bytes
font_01_sfnt_off0000ca3c.bin
beca8477c5cfa9296d2741951ad917e10e461255071aac3be4d0311a29bd5e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 5560 bytes
font_02_sfnt_off0000dcf5.bin
605bec7fecc360d3d0ddb3e756d80c04290a8d574299525280c6c9a447c738ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 14416 bytes
font_03_sfnt_off00010a12.bin
b355482eedaa8f12f901e8f1fc1eebbc92382ec59e518a47bfdb8a8563635439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 17464 bytes

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