Malicious PDF — malware analysis report

Static analysis result for SHA-256 378fcab379647096…

MALICIOUS

PDF

44.2 KB Created: 2020-08-06 04:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33436c55ab761c1fbcc492d2a91a1bf8 SHA-1: 39f83793809ed81e865f3251c7f5996030b9acea SHA-256: 378fcab37964709605892f57e6d4b2433781cfe93ea549e934558180600879bc
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=amoebiasis+adalah+pdf as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the redirection attempt. The presence of numerous external PDF links suggests a link farm or content distribution network used to host 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=amoebiasis+adalah+pdf
    • http://pibiv.parkhillkindergarten.com/uploads/1/3/0/7/130738731/rufusuduxibisejafu.pdf
    • http://files.cnhcep.com/uploads/1/3/1/4/131454986/123141.pdf
    • http://files.pvmsgeography.com/uploads/1/3/1/6/131637362/pamewaxagajuf-pajusuw.pdf
    • http://files.labsavvy.org/uploads/1/3/2/6/132695746/novopokozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/8757937677.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/24044428036.pdf
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/pugotefunefemanajofijesoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/14230176788.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/64514500495.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/13723977060.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/sudizimulel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/91019781664.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/tofif.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_off00006224.bin
2de18ddfac5af94dcaf18438fc2ed1e97e437495aa95f018c7c53c9fd396f593
pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 4916 bytes
font_01_sfnt_off000072d0.bin
ec26a94b79310b6bd04a3cfb031b98effec9ba31ae27545848c88e3865000458
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D0 10284 bytes
font_02_sfnt_off000095ec.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x95EC 4324 bytes