Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a443cb349e7d1c9…

MALICIOUS

PDF

64.8 KB Created: 2020-08-10 15:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96b7c8745bd5c2d9e6ca7fb8f504fb8 SHA-1: 569d5cb18c8906b6a7aeb62b1bfaf814ad144c0d SHA-256: 8a443cb349e7d1c9a2d1db9493ec6c9a764574764a42c511fc1efffd851ac386
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body, though obfuscated, contains the same URL as the malicious redirector, suggesting a lure to a phishing or malware distribution site. The presence of numerous other links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination.

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=types+of+pulse+width+modulation+pdf
    • http://files.circusparkmedicalvillage.org/uploads/1/3/1/4/131437044/7335143.pdf
    • http://files.areyoujustified.com/uploads/1/3/1/6/131636781/bunijivunivot-naludilivok.pdf
    • http://files.briggsquarterhorses.com/uploads/1/3/1/4/131453206/8311389.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/61197722596.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/77924022755.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/mopubov.pdf
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/tebumulani.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/advanced_english_tenses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/vafevexegupobinamezoje.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/21856275619.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/algedonic_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/xododivefip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3100/2269/files/xubedipuruxexojirewepozi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/28288223031.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/51413953645.pdf
    • https://cdn.shopify.com/s/files/1/0431/9723/5363/files/limifasaduvasiwoxo.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
font_00_sfnt_off0000a0d1.bin
7d6c8fef0b4d0d11e5e7f699b218a435190a9e07a8354bc3575aa94d1d1db13b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D1 5328 bytes
font_01_sfnt_off0000b2eb.bin
6b2d60737beb47c774294b043f2f35273d341416b89d0c67b7f9fd63bde2b0d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 14572 bytes
font_02_sfnt_off0000e117.bin
0da5b551d84a453f500a6ba8ca1adfd4400b36dae0f103b74fb712e1a4f46a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 16064 bytes

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