Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4661ff12afe6037…

MALICIOUS

PDF

44.2 KB Created: 2020-08-03 11:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db511e3a014b045c380995526e3fa00 SHA-1: e2f4b678b68da0828e1e9795f6f02cf98f42e315 SHA-256: a4661ff12afe60376752513f6e9d5d7b3e3994e005ae421ff0de2d002cdbe1a3
150 Risk Score

Malware Insights

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

The PDF file was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=amiodarone+davis+plus+pdf, which is likely used to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body contained mostly garbled text and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=amiodarone+davis+plus+pdf
    • http://files.pnwbees.com/uploads/1/3/1/4/131454034/muzibolenawenes.pdf
    • http://tosumi.christhamilton.org/uploads/1/3/0/8/130815017/tazuvafixelufudalul.pdf
    • http://files.tamethetigers.org/uploads/1/3/0/7/130739951/bowupawudaded_sumemobefig_duwisowemubomak_rojiboxabu.pdf
    • http://files.twistedbeaverriveradventures.com/uploads/1/3/1/8/131857199/609957.pdf
    • http://files.sonic-festival.net/uploads/1/3/1/4/131407629/dufibarositesu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/metotojaziz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/kukosidar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/wozerunoxemabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/65950585580.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/digubazaruvuwevigupitipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8104/0033/files/thani_oruvan_movie_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/jovumoxilaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/megipaxaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ccf.bin
f37e2d2fd39dd42b184cecbd1821097151581ac6fb6d8d6567317b8f5aa736c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCF 5036 bytes
font_01_sfnt_off00006dd2.bin
d6bdea23d6993821d2a960b426c58abe757510640506753d67546695305a471e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD2 12288 bytes
font_02_sfnt_off000095ba.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x95BA 4324 bytes