Malicious PDF — malware analysis report

Static analysis result for SHA-256 513817e2431661b5…

MALICIOUS

PDF

56.5 KB Created: 2020-09-07 09:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0c1c9916aa4620f1366abb4694401f6 SHA-1: 6382c8482f2debbb4f807e400a0f7004a827ee84 SHA-256: 513817e2431661b5f60a94a6a0734048228e0fa36ed835f678cb70f7ddabf6c0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.link'. The document body, though heavily obfuscated, contains text that appears to be a search query related to spreadsheet organization, likely serving as a lure. The presence of numerous external PDF links, many pointing to 'static.usrfiles.com', suggests a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=put+sheets+in+alphabetical+order+excel
    • https://static.usrfiles.com/ugd/b8c837_ebc206580f4e41639b32a3acb87238f6.pdf
    • https://static.usrfiles.com/ugd/740d8c_d206bb5e9b6148d6a2f27a2aa088acee.pdf
    • https://static.usrfiles.com/ugd/daca0d_a4cc217c4bbe435db6cefbb15745e895.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/24573938975.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0459/9401/6925/files/zozowofojaravas.pdf
    • https://static.usrfiles.com/ugd/b8c837_04a9ea6336e54b33a7498d49155cc6e9.pdf
    • https://static.usrfiles.com/ugd/cafc24_2b1ec97d53b54de0a6cec847e82e3015.pdf
    • https://static.usrfiles.com/ugd/c75f60_c8ac4b067c784f478fc6ac378799331f.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/burda_magazine_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/verijonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0641/8331/files/10971889881.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/
    • https://static.usrfiles.com/ugd/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000ba53.bin
54dd62e44387747b481a5ae438ccd818ac57a9b5bbabac64d7ca306bd366cff5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA53 17540 bytes
font_00_sfnt_off000071e5.bin
137e7a0e5530a10f996d4e011c7eac32202ab5b9796ca3ec428fba292ce88986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 5372 bytes
font_01_sfnt_off00008412.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8412 1800 bytes
font_02_sfnt_off00008ca2.bin
cf8d6f65b5e8509b938f74a1b46accaa63307dc6f75b3f5d10b6f5934d81b57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA2 14620 bytes

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