Malicious PDF — malware analysis report

Static analysis result for SHA-256 678bec2b4bbc2c4d…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 20:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93e461f2101a0f7cec738f45262025dc SHA-1: 50b00281b81a611bd15b40e03f8bb4b3aa8eb1a4 SHA-256: 678bec2b4bbc2c4d501663093263f6fdf60c91c64085c0d01bfb7767aa228d44
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded links, masquerading as a movie download lure, that point to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to drive traffic to potentially harmful sites. No scripts were extracted, but the embedded links are the primary threat vector.

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.me/wix?keyword=bhoot+chaturdashi+full+movie++in+480p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/73cb9e_ee3bdcb0caa54d50ac5d80438d56cea3.pdf
    • https://static.usrfiles.com/ugd/a8cc01_61a68c5e68494c2fb530f3f4ef74772f.pdf
    • https://static.usrfiles.com/ugd/299074_44069dc15f3247908997e5b288ac9c1b.pdf
    • https://static.usrfiles.com/ugd/837d34_b8dc8625786c4447bcdb1b6f0a7e923c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a0d3bf25dd049388d06aee2dfef8673.pdf
    • https://static.usrfiles.com/ugd/b8c837_9878380b4589458a9e397987f4a737ac.pdf
    • https://static.usrfiles.com/ugd/7dd30d_4122147fb7d441fabe453b73f600d92e.pdf
    • https://static.usrfiles.com/ugd/8ade13_e12884a2dfbb4a859fc9811f44be7961.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1319/files/sadorapinix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/92162303508.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/majikibimirotujumav.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/72815703009.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigagijewunafusigiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/besalegikowofogisixed.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ea1.bin
13c0abdb017d2354bd92661e7a183e0e77e7aa8d56cc3fab7a2f2aa16c2f19b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA1 5928 bytes
font_01_sfnt_off000062b4.bin
7d09bed883991bc1e5638c68015a35a03119ae6e1d47890938064bc4d28fd70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B4 5736 bytes
font_02_sfnt_off00007597.bin
cdae5d867fe06f8aac9a1ff28fefd5272d20555d7930d9b8acf781f95528d7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7597 10060 bytes

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