Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1e3b0a7a174a99…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 01:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a737eecc9d88e157ccea9c66384fd5 SHA-1: 620c3250a3bd4e0263a87117ec5b466628a38a4c SHA-256: 7c1e3b0a7a174a993f83e49dce8be30f523eb1315406bb2d34bbb8e5dcbdee54
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=3+abiotic+factors+in+the+tropical+rainforest'. Another heuristic indicated a PDF link farm, with many links pointing to 'static.usrfiles.com'. The document body appears to be malformed or heavily obfuscated, but the presence of these numerous links strongly suggests a malicious intent, likely for SEO spam or to lure users 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.ru/wix?keyword=3+abiotic+factors+in+the+tropical+rainforest
    • https://static.usrfiles.com/ugd/b8c837_259b529153ee4d06878348b75a9551b3.pdf
    • https://static.usrfiles.com/ugd/834936_2e52c489a7ad4fd187944198f5d27ae9.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_8db1e1c657ca4fbf98fa9ea58e877931.pdf
    • https://static.usrfiles.com/ugd/49be48_d1daa124868f4173939fbf5a71f431d1.pdf
    • https://static.usrfiles.com/ugd/ee4a13_ea22ec88fd8444519d2da5e0752a37f2.pdf
    • https://static.usrfiles.com/ugd/de02f3_a33709851f34458fa867d81d8b405538.pdf
    • https://static.usrfiles.com/ugd/ae15ca_cdd184e4e73c4526a79ee688992534f4.pdf
    • https://static.usrfiles.com/ugd/538d67_e83cfe657c1c43b48021cd49316dccc0.pdf
    • https://static.usrfiles.com/ugd/d63aaf_3253ab482e55466a89b782921f0600af.pdf
    • https://static.usrfiles.com/ugd/fac845_a1040d48d2c740b783453d72c3f7906c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5e88d230c347a6a819567be00ac3b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f454b93d6fad41bc85e70e7b7c8c3dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_29d15258593e44d387c7d55473aceaf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa28568802844c82bf3acaf25de470f5.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_35ee72d2984f47efa56dc8665ff8180f.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_off00006184.bin
e565617e564fdc12571923afd0b4c2b5c390c3f5f1699ebc4224d68bf18f1765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6184 5312 bytes
font_01_sfnt_off0000737b.bin
9064400e6b2cc2ebcce14fd02a7d6ee5d310c1246edde1d7d30d87fa65258029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737B 10156 bytes

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