Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab317b5a2c9d3fc…

MALICIOUS

PDF

34.9 KB Created: 2020-03-24 06:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27164bf6dcd3247426516f8675bee341 SHA-1: 52550591fe88d336cc32edf7058dc664f4dbb660 SHA-256: aab317b5a2c9d3fc385c86a2986ab0c5d24195244cf5c1413676c53b1d518639
96 Risk Score

Malware Insights

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

The PDF contains a large number of SEO-optimized links pointing to various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'Master lock' and wkhtmltopdf metadata, but the primary malicious activity appears to be the mass distribution of external links, likely to distribute further malware or engage in click fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://2bedroomupperwestside.com/uploads/1/3/0/7/130775337/130775337.html#master+lock+1500id+speed+dial+combination+lock+forgot+combination
    • http://pronaffiliates.net/uploads/1/3/0/2/130289161/4291635.pdf
    • http://thepoisedpaisleyonline.com/uploads/1/3/0/6/130604031/somiponubewix_wevaba.pdf
    • http://bracebridgerepaircentre.com/uploads/1/3/0/4/130488574/vufopinumikijo.pdf
    • http://mobintelligence.com/uploads/1/3/0/3/130324037/c6999fd.pdf
    • http://sbga51.sbgame.net/uploads/1/3/0/9/130969346/divebufoxizinazob.pdf
    • http://cheapceramicknives.com/uploads/1/3/0/7/130738822/menasarez-bosevemigev-vufefexebaf.pdf
    • http://activeaidpartnerships.org/uploads/1/3/0/7/130774969/rujik-lefagurezami.pdf
    • http://familyfarmandbakery.com/uploads/1/3/0/6/130620719/73abe41.pdf
    • http://finikaria.com/uploads/1/3/0/8/130873791/a0f3c7.pdf
    • http://digginlifestrategiccoaching.com/uploads/1/3/0/5/130544539/kudifudulo-zixobaluso.pdf
    • http://desatascosmollet.org/uploads/1/3/0/3/130313741/1322554.pdf
    • http://nataliavargova.com/uploads/1/3/0/5/130539249/a422139.pdf
    • http://cookingforabetteryou.com/uploads/1/3/0/2/130272095/bd63c8ad04aff.pdf
    • http://fundacionmisionerausa.org/uploads/1/3/0/2/130289738/46a9d458d2ba148.pdf
    • http://www.codespring.org/uploads/1/3/0/4/130476158/pesule-gofoxom-faroputota-vatoridur.pdf
    • http://moses-balan.com/uploads/1/3/0/5/130539726/sogegumemajo.pdf
    • http://gemini-coatings.info/uploads/1/3/0/9/130969424/pewovirovel.pdf
    • http://coffeeatyouroffice.com/uploads/1/3/0/4/130476798/tipikuz.pdf
    • http://mx.xcelitek.com/uploads/1/3/0/2/130270951/fadipuv-gekafatewob.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e62.bin
9a4f587721662cbeefe5a36b241e1cadabaee8c329b904a5406696683b705e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 7500 bytes