Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c816b57fcd4c67…

MALICIOUS

PDF

36.3 KB Created: 2020-09-05 22:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6a0b258acbe7de409c261902504b47 SHA-1: 35379a250b3ccc68a3acba4623f0efc0cc92d78c SHA-256: 74c816b57fcd4c67c4e85e99ae4e6d144205801de3079153007ae3f80526d2fd
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=wordscapes+answers+level+1124+mist+4', which is also flagged by heuristics as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites.

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.club/wix?keyword=wordscapes+answers+level+1124+mist+4
    • https://cdn.shopify.com/s/files/1/0463/0491/9712/files/neoplasia_hepatica.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/37539050902.pdf
    • https://cdn.shopify.com/s/files/1/0431/8635/6375/files/45465493888.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/13584463941.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/xenaxijatawixa.pdf
    • https://cdn.shopify.com/s/files/1/0465/0241/2440/files/loctite_596_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8253/8403/files/rujegumuru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/70849578020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/65913943206.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/92146544012.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3465/files/chunky_platform_sandals_heels.pdf
    • https://static.usrfiles.com/ugd/83f04e_a86ef4ce0eda4dad88d1f1e5ab4736d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_945b6f7220ff415db9fb288c663fedef.pdf
    • https://static.usrfiles.com/ugd/39d081_8f888cffac6c4c9c99b2e86e20cc10cb.pdf
    • https://static.usrfiles.com/ugd/eb4c03_69babda0803a4fc3b958668dabcabc78.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_off00004b98.bin
1f593b6543ae142cb164d365d85077d6732dff83be64dec10e4e5619de214bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B98 5656 bytes
font_01_sfnt_off00005ef0.bin
77b3d9bfad7ebac964378afdd9f20c61c6f113ecdbae3d8caf4ea0b297e37455
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 11780 bytes