Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a4ee355ddcd84e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1246b96edfb69a912cee14dce420ca58 SHA-1: 4463cbdbe4f84ab4dcc4145902c1211ff8fb50e3 SHA-256: d7a4ee355ddcd84edc6a7052be9458b4b99cb2e6312f9e5100621672e532d531
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to a battery charger manual and a URL that appears to be part of a SEO link farm strategy. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to the malicious URL: https://ttraff.cc/pify?keyword=cargador+de+baterias+schumacher+se-+4022+manual.

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=cargador+de+baterias+schumacher+se-+4022+manual
    • http://vurikajuv.crazydaisymarketing.com/uploads/1/3/0/8/130874633/ketaloxef.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/calculus_and_analytic_geometry_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/80862601201.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/tipos_de_hernias_de_la_pared_abdominal.pdf
    • https://cdn.shopify.com/s/files/1/0438/3129/6160/files/48082802914.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7268/files/zowek.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/99954270012.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/xupiwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/java_8_tutorial_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdf
    • https://cdn.shopify.com/s/files/1/0447/3192/4629/files/javascript_date_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/3851693906.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/mitawolegejeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/gaxizukegelumutiwuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/52372034775.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_off00006747.bin
bb38c05b420adc4e34654c4e02ce7fb9c3f19d1efee0ee35608d5827f9def6e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6747 5792 bytes
font_01_sfnt_off00007ae9.bin
f59961688ba32232a31016adfcf0046ac3757e145ebc86bb7787db6af55392b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE9 11956 bytes