Malicious PDF — malware analysis report

Static analysis result for SHA-256 101333b41fbec877…

MALICIOUS

PDF

56.7 KB Created: 2020-08-24 20:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 922d474c36c8b2f2ba9e6eee77b3ec64 SHA-1: 5a45978279db630fda4013f5b85c344b0b6559aa SHA-256: 101333b41fbec877f822801086f1cf123cfd74374fdc21d63de690712b982a42
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector pointing to 'ttraff.ru'. The document body text, though partially corrupted, mentions 'Audio/ video converter android mod apk' and includes the malicious URL, suggesting a lure for users to download potentially harmful software. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to distribute malware.

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=audio%252F+video+converter+android+mod+apk
    • http://files.chewinggumchains.com/uploads/1/3/1/4/131437889/zodawimaviwax.pdf
    • http://files.artofashesamuels.com/uploads/1/3/1/8/131856358/9883214.pdf
    • http://files.pandasofwar.com/uploads/1/3/1/4/131484328/dofigasuleg-wuvoki.pdf
    • http://fosufeti.ballaratbiblestudygroup.org/uploads/1/3/0/7/130776757/viforixiwiwonupoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/25973806308.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/68704245904.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/16651484741.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/xogilaritanet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/review_of_related_literature_about_absenteeism_in_school.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/adyashanti_true_meditation.pdf
    • https://cdn.shopify.com/s/files/1/0434/9349/0838/files/tazonivagutosufelevivakek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/63666972811.pdf
    • https://cdn.shopify.com/s/files/1/0433/4098/8575/files/myocardial_infarction_complications.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a565.bin
209f62c0b82c2d225891f316a9f2e2dded0b622ae98755ab1587a0e1217fc79f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA565 27560 bytes
font_00_sfnt_off00006df3.bin
ab6bca7a88527199b47625899e7df9030dcf83c7e1a9f2b8f76ab41d78dbfe93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF3 5156 bytes
font_01_sfnt_off00007f70.bin
f28c5855a59058308dbb19f52eafbd5b604d98e526c084c725a8fbbbe39fe641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 11608 bytes

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