Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f60a91f5412763…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 11:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9b1b4f8f1145cc615134b1f4a42056 SHA-1: 8784d5c0509cdd9519217ddf500d78b32f0bd50f SHA-256: b1f60a91f5412763c63611bc9088763c38b0df55290ebd1aa7a014275b5ac29d
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document title, aiming to lure users into clicking it. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful content. The document body contains the malicious URL and several other URLs hosted on Shopify, likely part of the link farm.

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=cateterismo+cardiaco+destro+pdf
    • http://tevunijag.earthtopdx.net/uploads/1/3/1/3/131383483/50e6ba5a3c9.pdf
    • http://files.trendythreadsboutique.shop/uploads/1/3/1/8/131856158/ee78fc.pdf
    • http://files.swisskonig.net/uploads/1/3/1/0/131070151/fcfa89c6b4.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/jimafafom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/xugotebuxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/csr_racing_2_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/60142897937.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/37078005810.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/11284129591.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/39307570065.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/dezatanebes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/97772329040.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/saints_row_3_cheat_codes_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5159/files/35297399858.pdf
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/tedolinapoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0440/7525/3910/files/1152302114.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_off00006622.bin
43229a1b8f3c4b45fc96db3b197b377c693f809a5fd7599e795a5e5ce58f5e36
pdf-font-stream PDF embedded font (sfnt) at offset 0x6622 5172 bytes
font_01_sfnt_off000077a0.bin
b400c02521e4af61c5e7610a77e4eac01564f74f8ad3c3a4ea474303231b77c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A0 11344 bytes