Malicious PDF — malware analysis report

Static analysis result for SHA-256 789539a8e54166f6…

MALICIOUS

PDF

59.8 KB Created: 2020-08-20 07:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efd47e372dd8659976b866fe167adf10 SHA-1: 8d6aacb7b7479273728957905e33b55b3156ee04 SHA-256: 789539a8e54166f6955e8931d11015ffa1b47593e5b429d27bb42b6812265020
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of many external links suggest an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=ascites+management+pdf
    • http://files.pitchervillesoap.com/uploads/1/3/0/8/130873718/deb4bb6e.pdf
    • http://bebaro.michiganpooltournament.com/uploads/1/3/0/8/130874222/zepaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/jurnal_asma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/array_of_names.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/bunigexavokuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/rafigawemuzi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/dosis_anti_tetanus_serum.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/padi_open_water_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7829/files/49150916041.pdf
    • https://cdn.shopify.com/s/files/1/0434/1956/6231/files/deduxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/31441201503.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/historia_completa_de_la_independencia_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0446/7815/2345/files/68713117612.pdf
    • https://cdn.shopify.com/s/files/1/0432/7905/7056/files/34384784416.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e5c.bin
5093da84e463c767be1533de3d6498a8045440295df0eb894a90b2f9645c45f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5C 5012 bytes
font_01_sfnt_off0000af4a.bin
35d7c1f3c57f94bf03bccc8fc6d0b568a895e38dfead4018dc3c6b224f536af5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 10868 bytes
font_02_sfnt_off0000d3f8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 4324 bytes