Malicious PDF — malware analysis report

Static analysis result for SHA-256 52523b0d26d71363…

MALICIOUS

PDF

49.7 KB Created: 2020-08-16 14:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ba726c0470782ff94c9c482c7ba237 SHA-1: 05ba305262b1859147891ef542cd18dac5182816 SHA-256: 52523b0d26d71363b3943e65da58acaa6a8c83acd40b77f77a3b101743e5a914
152 Risk Score

Malware Insights

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

This PDF document contains a significant number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable, but the presence of the malicious redirector URL and the link farm strongly suggest an intent to lure users to 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.cc/pify?keyword=cephal%252F+o+combining+form
    • http://files.kruzadakali.com/uploads/1/3/1/6/131637190/zuvaregadamadofiguko.pdf
    • http://files.cinematasmoviemadness.com/uploads/1/3/1/3/131380337/finekuvodir_nabawobiriz_xomokadimenim.pdf
    • http://files.opossumbottom.com/uploads/1/3/0/7/130739490/189c5420062.pdf
    • http://files.wellnesswednesdayswithkatie.com/uploads/1/3/1/6/131606431/mirudiwugivo-didugis-suxugegowib-xobadeze.pdf
    • http://files.littlebunsinc.com/uploads/1/3/0/7/130738970/sezonexokusutenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitomomuwarusubewikujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/alouatta_seniculus.pdf
    • https://cdn.shopify.com/s/files/1/0450/1517/1236/files/88192033693.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/fonusufalanenezujasupij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/sapufibogepiboxazajevisav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/arboricultural_method_statement.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/vezisododujudalikan.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/pisamuxipepena.pdf
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/wow_rogue_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/45566248050.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/sekifefuvudububagazavas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/21737567200.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_off00006a6d.bin
97f671de0ba2ba91767f9fde45f94b60676d57c043a50c36102d053fa6a24407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6D 5160 bytes
font_01_sfnt_off00007bd3.bin
7b00185a0f1f1e491e608823a81098848b3e906eef2ec0e53cef11a2c6a9dd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD3 15620 bytes
font_02_sfnt_off0000abb4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB4 4324 bytes

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