Malicious PDF — malware analysis report

Static analysis result for SHA-256 4095a3ff8c402a53…

MALICIOUS

PDF

39.6 KB Created: 2020-08-03 17:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a0e849df749e9a25f5a2635d133e93 SHA-1: 420b5f65d6186cb6f97d87f2cd4c36363f2d3e3a SHA-256: 4095a3ff8c402a5363eebd8a6a3c465e2d5fb0bbf853b046946588528a0309cc
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, embedding numerous external links, with the primary malicious URL being https://ttraff.com/pify?keyword=anti+skid+braking+system+pdf. The document body itself is heavily obfuscated and appears to contain junk data along with the malicious URL, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=anti+skid+braking+system+pdf
    • http://files.prideypets.com/uploads/1/3/1/3/131398268/6447774.pdf
    • http://files.millikenentertainment.net/uploads/1/3/1/4/131437702/632149.pdf
    • http://files.ckgrealty.com/uploads/1/3/0/8/130813042/1293360.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/bamabuluvasiwalevemidan.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2785/files/google_wifi_centurylink.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/57675233608.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/sagurepenetolewonojelutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/55802603237.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/big_balls_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/xutilalusijijesubofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/59750922476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pinabazebovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/paint._net_smooth_edges.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/dirigamozotelala.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/vafipadafoj.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_off00005e59.bin
e246d7b9b5fc252ea63a64ff82b87373be433c9315a2341885289fa29853de46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 5624 bytes
font_01_sfnt_off0000716c.bin
280e8afd5bf9fea452d8e8018b97654312c0675361b42a70ab4436f1b3a597b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716C 9464 bytes

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