Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1efb990d402b6bc…

MALICIOUS

PDF

51.1 KB Created: 2020-08-22 14:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5a2aa6ba1d5b3e7fcaddaaace061aa SHA-1: fb8cd68b3715dcfd9352890e7565f088e59b1092 SHA-256: a1efb990d402b6bc8d109de4cb2c8d32552bee471c068174d614ce324caa5ea7
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a 'credit card churning spreadsheet' which redirects to a malicious URL. The document body, though heavily obfuscated, contains the same malicious URL. The PDF was flagged by a machine learning classifier and heuristics indicate it is a malicious redirector and part of a link farm.

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=credit+card+churning+spreadsheet
    • http://files.projectfulfill.com/uploads/1/3/0/7/130775853/noneso_benuwuwuk.pdf
    • http://jajapo.pesartandgarden.org/uploads/1/3/0/7/130775677/gonedukupizigiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/28104795938.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/faxofadevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/13748909532.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/neburemajukonupe.pdf
    • https://cdn.shopify.com/s/files/1/0440/0431/1190/files/limokavapabagixotoxezuje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/definicion_de_codex_alimentarius.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/24843238018.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/zedejijanugani.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0358/files/mipejaretemabelubene.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/vezugobukozolut.pdf
    • https://cdn.shopify.com/s/files/1/0434/6288/5541/files/70739219841.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/japoroga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c17.bin
3a03f183041b1313e7e9ba3c29ea548e1e07a72008de7acc6937c1c927f0195e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 5100 bytes
font_01_sfnt_off00008d5f.bin
40e093bf12ae759efb027ceae1a9e9791fa71ac30f7d451550640c7b4d5b6085
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5F 10544 bytes
font_02_sfnt_off0000b14f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 4324 bytes