Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8ce80989af1b9b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 05:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215f3048699d01528d03fee6738cdddb SHA-1: 3153d7210dd95030ccb995b51b048038b80712d0 SHA-256: 3e8ce80989af1b9be25442b9131f8612e0a43e0beee41f6f182f3449c96726f3
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as a printable letter writing template. The ML classifier strongly indicated maliciousness, and the PDF was found to contain a large number of external links, many pointing to benign Shopify URLs but also including the primary malicious redirector. No scripts were extracted from this sample.

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.com/pify?keyword=letter+writing+template+printable
    • http://files.congrevelab.org/uploads/1/3/1/3/131398605/gejoge_libubipo.pdf
    • http://mefaner.3blossomscafe.com/uploads/1/3/2/8/132814439/3079174.pdf
    • http://files.townsonsmithdesign.com/uploads/1/3/0/7/130738710/kimukadogo_bawujekuba_linomagid_rusawibi.pdf
    • http://zijawaxit.churchofchristturlock.com/uploads/1/3/1/4/131453574/1578903.pdf
    • http://files.pjobrienbmx.com/uploads/1/3/1/3/131383630/540258.pdf
    • https://cdn.shopify.com/s/files/1/0428/1561/9239/files/3835092919.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/41238794175.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/advanced_actionscript_3._0_animation.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3555/files/bmg_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/sifopanegosomufabijujuka.pdf
    • https://cdn.shopify.com/s/files/1/0449/5418/9983/files/rom_aosp_rro_andromax_a.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/evidence-_based_medicine_guidelines_for_migraine_headache.pdf
    • https://cdn.shopify.com/s/files/1/0432/7119/2732/files/91721966109.pdf
    • https://cdn.shopify.com/s/files/1/0436/2482/4995/files/96485030628.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2865/files/34976958962.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/1._7._10_pvp_servers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5793/7561/files/xuxitumapezomojededexibus.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_off000061d8.bin
e5b652db1fdf40ba0b3b71065dbe37bfe99954ebc09c28f5c8af9b02fd9c29d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D8 5136 bytes
font_01_sfnt_off00007349.bin
9b67a6e80cd152522fcca4020f3c867cb320fc2b2ac336aa2125830bdf1c310c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 10172 bytes

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