Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7b87e92f64e82c…

MALICIOUS

PDF

44.6 KB Created: 2020-08-28 22:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3779f71b10a27ab97a910b80e559fa79 SHA-1: 6c192d03336af10fb3f8e15f3e54cd763a26c780 SHA-256: 3b7b87e92f64e82cfe102dd3691d07d62b56df8492f55fd7a68e70f91c00fc1d
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for phishing and malware distribution. One of the primary links, 'https://ttraff.cc/wix?keyword=download+gratis+film+pengabdi+setan+2017', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading a film, reinforcing the lure. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm designed to obscure the malicious destination.

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.cc/wix?keyword=download+gratis+film+pengabdi+setan+2017
    • https://cdn.shopify.com/s/files/1/0459/7071/8887/files/rukif.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/tanoposowev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zemivok.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/38391519570.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuzodatusowajukekef.pdf
    • https://cdn.shopify.com/s/files/1/0434/8103/9013/files/revofiliju.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/10881366846.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2002/files/11071417200.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1644/files/employment_contract.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/27262347123.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/vosevunubebelimowofone.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/tupatani.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffd1bbf60eb34cfbb1c6da734c7142c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_63d74fb18a554f81931d84a70dbeb211.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e9eb2a86294556bd47030af114e33a.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_off00006e5b.bin
b5e3d1379db18d2767b28ee3835d116a9f69db38178caa6a7dc2392c6623bd28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5B 5996 bytes
font_01_sfnt_off000082d2.bin
ad4704e7a83d72285a0f4efc47d1273c93ff5437e1f1ea829be8f291b4e73c99
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D2 10088 bytes