Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d792e4097fff5b7…

MALICIOUS

PDF

40.6 KB Created: 2020-08-09 22:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc933cbc5d127906754efa786f11cfa SHA-1: 305633d4da46a24cd338680623113c765195c76d SHA-256: 1d792e4097fff5b7db6502924d66160acef8b04d135680fe23a5560c51ccb0b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to download further malicious content or redirect to phishing sites. The ML classifier strongly flagged this PDF as malicious.

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=dr+sc+sharma+accountancy+class+12+solutions+pdf+download
    • http://files.itschima.com/uploads/1/3/1/4/131454098/fetil-kuzozozinawedap.pdf
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://files.uclagoingglobal.org/uploads/1/3/1/6/131637362/82ae3872b094bf.pdf
    • http://files.jenimahoney.com/uploads/1/3/0/9/130969545/puvugunak-xakuforavejomoz-larepiduroxe-sajinefafaze.pdf
    • http://files.devonthecarguy.com/uploads/1/3/1/3/131379980/fc26eec974cb2.pdf
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/96632210604.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/unearthed_arcana_classes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/asme_b31._3_acceptance_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/ruzikopozonola.pdf
    • https://cdn.shopify.com/s/files/1/0434/3254/2369/files/16828309692.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/wojunebuwogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/zolenag.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/78765988329.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/64724635730.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_off00005e80.bin
ba778e9a4339cbfaa3ebb9fef1dbe4503654f1ba89b268c8c56e2038773c4348
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E80 5772 bytes
font_01_sfnt_off00007224.bin
c23ecfecca745b5937aab1e714326fc4d7e880fd41eec5085cbb95cfc9839682
pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 10216 bytes