Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcece962e143bbbb…

MALICIOUS

PDF

42.1 KB Created: 2020-07-15 07:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb46f21e0a4c67355a8af5e290b37b9 SHA-1: eff154d82c697e9bba8a7d1364c85cc038d1466e SHA-256: bcece962e143bbbb74b856ff163f7b92543065879ecd2aed8f1f23039652f6b1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear user-facing text, but the presence of a link farm and a malicious redirector suggests a phishing or malware distribution attempt.

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/wb?keyword=glass%20for%20manual%20call%20point%20bfg-3
    • http://files.llanrhaeadrgardeningclub.com/uploads/1/3/0/8/130874296/bfec5d.pdf
    • http://files.carawaydeafyouth.com/uploads/1/3/1/1/131163846/rizafobot-jotekaladanegel.pdf
    • http://files.dayofgrace.org/uploads/1/3/2/8/132814239/gosigugolige.pdf
    • https://derutosudimi.files.wordpress.com/2020/07/wemudepiripeworawirovilu.pdf
    • https://fewiveke.files.wordpress.com/2020/07/maxumimoxupif.pdf
    • https://popuxokogoju.files.wordpress.com/2020/06/taguwutamiku.pdf
    • https://pipozegelone.files.wordpress.com/2020/07/jowike.pdf
    • https://kodelemepopi.files.wordpress.com/2020/07/gepukitowipagon.pdf
    • https://zovotapalu.files.wordpress.com/2020/07/56433320771.pdf
    • https://kipevofi.files.wordpress.com/2020/06/nasijibapexivakezosatara.pdf
    • https://ratabewabi.files.wordpress.com/2020/06/82553016133.pdf
    • https://nujejirexide.files.wordpress.com/2020/07/33453268514.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/walafubijilubalasoxeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/giwaziverirajose.pdf
    • https://cdn.shopify.com/s/files/1/0429/5881/5398/files/rufazanojalepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/debaviwavomegalawino.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/ruvojixonubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/xisufidozikeru.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_off000065b3.bin
e6b8f579759b2c1ae7fd2c0a8615a15b251cfaf5ab8f1ad6049cd321e7fa0655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5468 bytes
font_01_sfnt_off00007836.bin
eb8d025f5c9b0a37533af03b587042f7c40e595249b1e70b5307e7db193ab6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7836 10188 bytes

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