Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd83287f23eb029…

MALICIOUS

PDF

82.4 KB Created: 2020-08-31 08:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfa8ef7fa587fee4e100375fc6678310 SHA-1: 7e9d808b14cc1db2e9a5e63fb6d39b735a3a039c SHA-256: edd83287f23eb029fc0bda6ea0b8657470a60295766ea2a6ec80ada7e19821ba
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'educational physical education for preschoolers'. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or redirection strategy. No scripts were extracted from this sample.

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/wix?keyword=aprendizajes+clave+educacion+fisica+preescolar
    • https://static.usrfiles.com/ugd/003b86_93de085b1fbc4ded8fddc2ba856cc97f.pdf
    • https://static.usrfiles.com/ugd/aff7ca_1e811dbea9dc4b868ab714b7ba236095.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7721a74e7c04820b2f17953fdbb5f10.pdf
    • https://static.usrfiles.com/ugd/22bf55_d702d005dca84f86b464b9f3f9a287e1.pdf
    • https://static.usrfiles.com/ugd/dcfb95_1a9efa4b5cf24181815e1a133a0a2d43.pdf
    • https://static.usrfiles.com/ugd/2e16aa_b02f540db8994227a8bc7e8a4236af8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a53d74d6314b2a846eda4372a4e479.pdf
    • https://static.usrfiles.com/ugd/b8c837_71205bbc53eb4b099c60c9424b31e795.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_53b72036f51c49c89c5044554334ae68.pdf
    • https://static.usrfiles.com/ugd/b8c837_303232f9f404437f857f283d6736e7b7.pdf
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/86400_seconds_in_hours.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5619/files/87044065695.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/87919260388.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7090/files/22557406376.pdf
    • https://static.usrfiles.com/ugd/b8c837_3457e671e6fb4533951ef01701bff528.pdf
    • https://static.usrfiles.com/ugd/6da380_52572ae3cf8747b085ec78ccef174cd7.pdf
    • https://static.usrfiles.com/ugd/9374a7_4018f0456b1f4c88ae3831cbc365f827.pdf
    • https://static.usrfiles.com/ugd/fa6f14_e5038767718346ff813245f91fc3c212.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_off000102fc.bin
e7e1b876ecc10b7e26c880fb78b4365fcf3ce244bbe58a321040bd1afee3f9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 5324 bytes
font_01_sfnt_off00011530.bin
9bb027a3136d8ac215571d48ca5a74371a7f1959514aba5f205c215d0aa62bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 11540 bytes

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