Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa17b68f475d221f…

MALICIOUS

PDF

36.3 KB Created: 2020-08-23 19:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c8adfea6ecdc5b4c3598798e51684c SHA-1: 699d9393aa7bb5137f16da0fcfe049d73003de4f SHA-256: aa17b68f475d221f6129ffc68526be2446e6b90125c59a1bc634eb36264c06c4
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with the primary redirector URL being https://ttraff.ru/pify?keyword=wwe+balor+images. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a link farm points to a campaign distributing malicious content.

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=wwe+balor+images
    • http://files.sacajaweadar.org/uploads/1/3/2/6/132695995/xinera-xepox-tiradepufudu.pdf
    • http://kizozujav.plant-miner.com/uploads/1/3/1/4/131453870/ruzapux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9349/8787/files/android_aapt2_process_unexpectedly_exit.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/xoxotadosixevizifo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/64136619754.pdf
    • https://cdn.shopify.com/s/files/1/0437/2509/5062/files/nuvemisek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0990/files/sovojubinali.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/41311130812.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/9350462905.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/jozovibesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31184917419.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050ce.bin
07af48a3ed7ad48c7ecf8413ca5b9cb20d3d8fb3874be6ee484aaa159752bdbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50CE 5252 bytes
font_01_sfnt_off000062ab.bin
265f5000b8624fc59677095416cdbf081ac3d80bc7062f6496fea9a1ffe067ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 9980 bytes

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