Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcd546c475178b8…

MALICIOUS

PDF

47.2 KB Created: 2020-08-09 00:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 417409b5a9e65b3e73f8468e3fbcad0b SHA-1: 72f67ebab21c230ef853125f6b9aab159e5f7d27 SHA-256: 5fcd546c475178b8b7668346c5184919bb3046af2e7409b45c2197915591e4ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded URLs are indicative of a phishing or redirection scheme.

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=biodegradabilidad+definicion+pdf
    • http://wepoloki.healthkeeperz.com/uploads/1/3/1/3/131384424/6106220.pdf
    • http://files.catherinehoodillustration.com/uploads/1/3/2/6/132682134/634499.pdf
    • http://files.stjames-ri.org/uploads/1/3/1/4/131453969/dawelajopeze.pdf
    • http://nexelege.concordiavocal.com/uploads/1/3/1/4/131437462/daf8c87.pdf
    • http://files.thetipsyredfox.com/uploads/1/3/1/3/131381231/9460849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/hp_m401n_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/71416011219.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/78764899582.pdf
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/21482288622.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/kenneth_rosen_discrete_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/novusaretikoxasogina.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/78888823034.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/87052928651.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/que_es_musica_clasica.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/26408974119.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/brecht_galileu_galilei.pdf
    • https://cdn.shopify.com/s/files/1/0433/8732/2522/files/38621002443.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/wamajonikivirolitowibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/pawuxuboramowo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644f.bin
9377420ac963bf07559d941523781796329585b249b3d04a9d7590b18bb69d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644F 5044 bytes
font_01_sfnt_off00007574.bin
d2ebb70b98e1beae7adfb554dcc23e60a8a0e63396b38d8698d020392f8075cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7574 14292 bytes
font_02_sfnt_off0000a173.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA173 4324 bytes

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