Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3545ba7cf86cd6…

MALICIOUS

PDF

48.0 KB Created: 2020-08-20 04:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58f142419e407ec5bb817eab62c6e24e SHA-1: a5a9ac21ca05bb91ecb2157e3acbbc3c45fd3a51 SHA-256: 5a3545ba7cf86cd6fcaa3d7515ce60a29b1203747419e1a5461b12a3bb68e9f6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to shopify.com PDFs, but also includes a critical link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=browser+games+no++2018'. This suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution. The ML classifier also 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.cc/pify?keyword=browser+games+no++2018
    • http://devija.destinyinthedetails.com/uploads/1/3/0/7/130775087/kubinapolub_losumiru.pdf
    • http://wumosow.cdestem.com/uploads/1/3/1/4/131409090/kasupokeveto_wezavanepomi_rirebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/63202367383.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/73308550421.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/50801448211.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/liquid_chromatography.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/22115642716.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/corpse_bride_piano_solo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/acrobat_pro_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/d_d_4e_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/taduwotopiwotevapog.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007543.bin
6e8fdaaf7abd5d73933bab911eff060bce64d20bd6ecd28fe336ced8cd0ad3ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 5636 bytes
font_01_sfnt_off00008873.bin
07f3d2721019a5ef60f5c807a2c59da8d496ffbba7fa73a8c69d37ecad349460
pdf-font-stream PDF embedded font (sfnt) at offset 0x8873 13724 bytes