Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7d3d45263efca9…

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 05:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c0571346a20793415c9f1161be6b11 SHA-1: 4d26ac6ce109818b334c7acb164d69569f2c9ad5 SHA-256: 0c7d3d45263efca9834cb526ee892310d9c9bc993575c3f61efaba82285287ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a crossword puzzle answer key. This redirector likely leads to further malicious content or exploits. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the presence of the malicious redirector and the lure indicate a phishing or redirection attack.

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=new+york+times+crossword+puzzle+answers+0914
    • http://files.drlisamurphy.com/uploads/1/3/0/8/130813448/kuxulujuzutepupivul.pdf
    • http://lalusivu.bee-strategies.com/uploads/1/3/0/8/130813528/928344d8d302ccf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7396/1126/files/pneumonia_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/15457908979.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/20515437480.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/71961072804.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/tawewel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9351/files/dixewamijisitapoxuxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/bolaxivabanavebejujirevil.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/dsp_algorithms_using_c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f73.bin
1972f2af7ebcc1864cf3e8fd53ded317f9a5968268a616375d6643449fdbe50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 5936 bytes
font_01_sfnt_off000073bf.bin
883277f4aacfeb767a48d58882e86af1d79c44d2160251bfdbcc899a5637f9fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 10356 bytes