Malicious PDF — malware analysis report

Static analysis result for SHA-256 1590706c210d1d4c…

MALICIOUS

PDF

38.9 KB Created: 2020-07-30 14:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39362eea15098a932945d3bd8d9054f SHA-1: 696a2f326ce34d51ff1f781f17411e39f242bf04 SHA-256: 1590706c210d1d4c99ae32bffb95c15f5810186b959be58ec68bffb1650815f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be related to a worksheet, suggesting a lure for users. The presence of numerous external links, many hosted on Shopify, indicates a potential link farm or SEO spam operation.

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=personality+adjectives+worksheet+intermediate+pdf
    • http://files.faithutah.com/uploads/1/3/1/4/131483343/6805518.pdf
    • http://files.maclucille.com/uploads/1/3/2/6/132682905/gobikonuru_bekezuxal.pdf
    • http://files.stlukeslanesboro.org/uploads/1/3/0/8/130814101/josulajosam_kivijiri_lozibaf_nijozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/gerewiposakujoguripudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/genasebufita.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/81496608840.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/55320022515.pdf
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/pavenisolepomedolodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/35701091912.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/79160143488.pdf
    • https://cdn.shopify.com/s/files/1/0429/8407/9523/files/90476441996.pdf
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/31274562756.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/47598749541.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/pofomotamuvive.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/94414020845.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac4.bin
c2f187036363da5704a6f75faa213fffd4a8a95d7b88bcdae393c2f1b7c77201
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC4 5576 bytes
font_01_sfnt_off00006da6.bin
99cf40cfcbfb52814b90b33c6dfc4c3b64137d5bf47b53e3cfdce9cdda92437d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 9532 bytes