Malicious PDF — malware analysis report

Static analysis result for SHA-256 b131f4ad6a8d7177…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 05:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2347f0d2ef430cf85b6439a5678a251 SHA-1: d4693c3d722d35e07ebe18c6f7a99f328543257d SHA-256: b131f4ad6a8d7177fe19e684f5532f5f0fbf428c84478f1374f0a92b2da2c505
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=statistical+arbitrage+machine+learning+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting an attempt to disguise the malicious intent.

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.cc/pify?keyword=statistical+arbitrage+machine+learning+pdf
    • http://files.albanianamericanbarassociation.com/uploads/1/3/0/8/130814411/dumowivibufominekil.pdf
    • http://files.juliethegardenfairy.com/uploads/1/3/0/7/130739116/f474d.pdf
    • http://files.southbuffalowheelhouse.com/uploads/1/3/0/8/130874431/korovuzeverukuk.pdf
    • http://files.amberward.org/uploads/1/3/1/4/131454034/8473888.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/45062101475.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/vizikujuseliwebanixiwu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2812/6618/files/22038376514.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/22686025704.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/xudejubupalo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/nobibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/raloxabuleze.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/handboek_ergonomie.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/foxekizawizidimuvobexavar.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/69004736871.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/74064800119.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/6856664720.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_off000068fc.bin
b01b95d7cbd9eebdfdd9d42733cd1a8a8fb415fbb23b16c292ca236b0c5b1b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FC 5812 bytes
font_01_sfnt_off00007c82.bin
fad5e8c5beef82bd5f50f8ba984fff808c3613e524bbaf7e099b7f7949c660a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 9804 bytes

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