Malicious PDF — malware analysis report

Static analysis result for SHA-256 391e4e067217e1cc…

MALICIOUS

PDF

41.2 KB Created: 2020-08-20 03:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd00799371d0c9e0960fbcd1ae4a85d7 SHA-1: 28aba6881f3c1ce57a48145238dcaff5a89c4eba SHA-256: 391e4e067217e1cc47a7f46830c19064647f2602128d58090bd2030fa9712d66
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to PDF files hosted on Shopify. The primary malicious link, 'https://ttraff.cc/pify?keyword=picsart+latest+version+mod+apk', is a known malicious redirector. This suggests the document is designed to lure users into clicking the link under the pretext of downloading software, ultimately leading them to malicious infrastructure.

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/pify?keyword=picsart+latest+version+mod+apk
    • http://xopexunex.deltahouseinc.com/uploads/1/3/0/9/130969600/fijebamizedumutawegu.pdf
    • http://nazufukeg.wfcharborne.com/uploads/1/3/0/9/130969744/turemosutinib.pdf
    • http://files.cleftstrong5k.com/uploads/1/3/1/1/131164009/41e2784.pdf
    • https://cdn.shopify.com/s/files/1/0436/6571/9449/files/dudexowukamegederejil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0554/0509/files/23708660684.pdf
    • https://cdn.shopify.com/s/files/1/0437/4223/2725/files/xareg.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7607/files/wojutuweji.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/mixulegumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/59014455782.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/livro_sobre_o_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/vetofat.pdf
    • https://cdn.shopify.com/s/files/1/0436/0113/3731/files/wovavuxuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/scones_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/arpeggio_patterns_piano.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/ndlea_shortlisted_candidate_2020.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_off000063fa.bin
e0dd64d5f3bd4c73cd53000b8f44d66498436d95672b0be991301693c7ff1ddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 5344 bytes
font_01_sfnt_off0000760b.bin
7ee68c144091f1c4092428ef7ce9f022a2419cd216a38ff52d8ebcd1598de5e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x760B 9920 bytes