Malicious PDF — malware analysis report

Static analysis result for SHA-256 db95c4caa45a56e9…

MALICIOUS

PDF

53.8 KB Created: 2020-08-11 22:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abb007a4735bccce5582bf128b97c80 SHA-1: 61c7813ba1ab6423bec65a4e44c3ae1c44875252 SHA-256: db95c4caa45a56e9d66e95d57cc13b6fce41801ac90cc15f85416d196e44518b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=learn+arabic+online+free+pdf'. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also 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.com/pify?keyword=learn+arabic+online+free+pdf
    • http://files.myglenoak.com/uploads/1/3/0/8/130813526/jevanaroje.pdf
    • http://files.keithdeininger.com/uploads/1/3/1/4/131438079/5893962.pdf
    • http://files.fundle.us/uploads/1/3/0/7/130776749/xupaxafadaro_xeralekipe_lojumug.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/27682041971.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/matip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1110/files/39331824183.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/zalofopojazetapimawaze.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/funuxojomotimunelop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/another_bites_the_dust_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/42055313794.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/borg_scale_6_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/carboxiterapia_flacidez.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/77780630836.pdf
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/30057505690.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/45023259081.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/the_babysitters_club_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/jesosesali.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
stream_005_off0000a5af.bin
a32b20d2f423f55d00ab9ba744e85d34d08f2b899d1e71374e49310cc1a4d6da		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA5AF 21628 bytes
font_00_sfnt_off0000716f.bin
cb8c562633d5145f3a097a831b29af965b1ebf07c412d02174a05c33e8272552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716F 5052 bytes
font_01_sfnt_off000082a5.bin
2916a482f266018c1c8423ddbf5cdddf04fd4b16d8295a8d764db0b75e4e67d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A5 10192 bytes

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