Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb977447804544d8…

MALICIOUS

PDF

43.5 KB Created: 2020-08-18 19:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f541d03102112ccc96772802f4b4eb5f SHA-1: 63c84a207bd2f04a4d80754a02a0823fc4a5d659 SHA-256: fb977447804544d8aadc3115bd17bf4a7995cffda09124b1548e8b6ca49bff1b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to potentially malicious redirectors like ttraff.com. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=top+funniest+family+feud+answers', indicating a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDFs suggests a link farm or redirection strategy to distribute further malicious content.

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=top+funniest+family+feud+answers
    • http://files.hillcresteastpoint.org/uploads/1/3/2/6/132681145/f42a5f481.pdf
    • http://kebupol.virtualvideogamestore.com/uploads/1/3/1/4/131437774/d1141.pdf
    • http://tulabafes.lockehavenfarm.com/uploads/1/3/1/4/131408061/zomijiduxidegejut.pdf
    • http://gorumesi.twodaysnewstand.com/uploads/1/3/0/7/130739826/liniviwaminokune.pdf
    • http://nogogego.bloomcreations.ch/uploads/1/3/0/8/130814058/1344735.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/pajekijemimawufivated.pdf
    • https://cdn.shopify.com/s/files/1/0440/6942/1206/files/dr_kambikuttan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78491346320.pdf
    • https://cdn.shopify.com/s/files/1/0448/9786/1787/files/bioenergetics_file.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8381/files/the_pact_jodi_picoult_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/kufivejofejutirogutamexan.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/wivolotoka.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/vafiwaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/fruit_batteries_science_fair_project_guidebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/fizizazatepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/buxupebutixanomumobomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39086675177.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://cdn.shopify.com/s/files/1/0431/5

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bbb.bin
b11e56631c93ca33dda60e5b61ecf70df360ab5079a0afeceb732e59725b5505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBB 5332 bytes
font_01_sfnt_off00007dd7.bin
f440c591fb4a7ab271607ae6b286184895513d51ba56b8c5911b32ea78f43f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD7 10292 bytes

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