Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b7c1d9dfef84f…

MALICIOUS

PDF

64.2 KB Created: 2020-07-31 03:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00fb776a14dfac943db0aa9da7fbb113 SHA-1: d06af35389d1f5c4bb1b95925f2c05192af17ee0 SHA-256: 681b7c1d9dfef84f83351c1fb5776cba902ebe00f5df6d72754a93f58dc431d2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links are the primary attack vector.

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.com/pify?keyword=curriculum+vitae+espa%25C3%25B1ol+pdf
    • http://files.mrtranhistory.com/uploads/1/3/0/8/130814009/c47c18e7.pdf
    • http://files.positivitymagic.com/uploads/1/3/0/7/130738752/vakebuxetul.pdf
    • http://files.claycountyhistoricalsocietyin.org/uploads/1/3/1/4/131405976/zasulidesip_dexaja_rukikux_tapepaduzopa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/5834559799.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/42300285430.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3699/files/zesajikaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/sajezixow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/55150726503.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/45136153621.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/70247727907.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0133/files/loborebufobojevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/wurekepojabisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/43145062680.pdf
    • https://cdn.shopify.com/s/files/1/0430/0229/8521/files/92151014683.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4cb.bin
d4a44ccb36864aa37c4b60712a0a1ead22d1d6e6f033fb61634301d7dd59139e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CB 5372 bytes
font_01_sfnt_off0000b6f6.bin
06715a7f83433e322861e455c864def826816e66249f2f086c915748ce16754b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 10764 bytes
font_02_sfnt_off0000dba6.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 16312 bytes

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