Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3ba5fed3b8b618…

MALICIOUS

PDF

43.1 KB Created: 2020-08-19 23:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66808653df12ba3ee36514c9e0b8643c SHA-1: 79d269042df43dc242908e11f1ad66dd52a6ecc0 SHA-256: 5e3ba5fed3b8b61842d351be64fe1b099df238df535fe7abe6fc7f96bef44c26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=hidden+call+recorder+app+for+android', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'hidden call recorder app for android', suggesting a lure. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm used for SEO poisoning or distributing malicious content. 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.ru/pify?keyword=hidden+call+recorder+app+for+android
    • http://nofib.sgfaerialfitness.com/uploads/1/3/0/8/130813577/wifipogunusoxog-zaxujuna.pdf
    • http://dojat.robinrgriffith.com/uploads/1/3/1/6/131636761/nubibiwesudej-tinasunujejob-tasulejera-dodibosedox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/45235018394.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3380/files/college_sociology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/nutuzaxax.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/pomikeribop.pdf
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/27836975714.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1605/files/pdf_to_word_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8248/8733/files/86690234335.pdf
    • https://cdn.shopify.com/s/files/1/0432/5841/3216/files/48699509110.pdf
    • https://cdn.shopify.com/s/files/1/0461/1332/5219/files/baby_are_you_coming_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/pikipezarodalutugidip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/fexurabogo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/50234804086.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_off00006b31.bin
b364e052b73773a1d6770a42ed8acb0206dd564ebf44efba3a0a28432faf5042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 4932 bytes
font_01_sfnt_off00007bf8.bin
65b2944b1efabab65c955b75990322642efb56a71d535f6fc5baf541bdf3dcbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF8 10332 bytes

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