Malicious PDF — malware analysis report

Static analysis result for SHA-256 371706ffc5de8b5a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-24 06:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd427120d1b9e7dd3d7ccfb19d898607 SHA-1: 43ad34c166ce44b57910678c0f9c892fd7de7a9d SHA-256: 371706ffc5de8b5a568503c085193cc28ff7caf28545240a6fb79a6a1ae25329
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is largely unreadable, but the presence of numerous links, including one pointing to `ttraff.ru`, suggests a link farm or redirection attack designed to lead users to 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.ru/pify?keyword=slip+sheet+vs+wood+pallet+advantages
    • http://muret.amphionpercussion.com/uploads/1/3/1/6/131606069/8a82f2368ba7.pdf
    • http://dajef.durjavaoriginals.com/uploads/1/3/1/4/131406717/8802851.pdf
    • http://files.thecarmaven.net/uploads/1/3/0/7/130776420/tugul.pdf
    • http://jukudevab.sullenwhimsy.com/uploads/1/3/0/7/130775626/72c20.pdf
    • http://josawa.thesienagroupllc.com/uploads/1/3/0/9/130969045/dizud.pdf
    • https://cdn.shopify.com/s/files/1/0463/2487/5425/files/aol_outgoing_email_settings_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/vebebusopa.pdf
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/xokoxafimedarobogiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4547/7800/files/54770156840.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/god_damn_you_re_beautiful_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0457/7004/7654/files/choki_choki_shiva_live_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4006/3143/files/maulana_tariq_jameel_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/20537939461.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/fun_home_alison_bechdel_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/gigebuzono.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_off000065f1.bin
2d53d0a944bf4b7042a82113d7a2e11b2581e10081d9f9b4296546b24a3ead4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 5380 bytes
font_01_sfnt_off0000784e.bin
354d16d685129295eeac7df031b7e265741d33254a6287997874a571704902fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 10388 bytes