Malicious PDF — malware analysis report

Static analysis result for SHA-256 1871cf7074c7a313…

MALICIOUS

PDF

44.5 KB Created: 2020-05-21 00:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a7e24aa084022038024ba06be93446f SHA-1: ac12736ae348d8443bc8ec44e8d58c149c8163e5 SHA-256: 1871cf7074c7a313f01a1f933900f329ef9c65f29110e2453e4ee2759ff162dd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains references to 'Wasteland 2 faded photograph' and authoring information, but does not provide direct instructions or lures. The primary malicious activity observed is the mass distribution of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://taoswellwoman.com/uploads/1/3/0/2/130287881/130287881.html#wasteland+2+faded+photograph
    • http://empireofthemoors.com/uploads/1/3/0/6/130604040/5e46998.pdf
    • http://harrishelpinghands.com/uploads/1/3/0/3/130312980/1983731.pdf
    • http://donaldvega.com/uploads/1/3/0/6/130620509/tigav.pdf
    • http://mnproducciones.com/uploads/1/3/0/5/130539059/2570101.pdf
    • http://homeimprovementhelpers.com/uploads/1/3/0/2/130289345/lanos_siputiwizomas_dovotoxonepewe.pdf
    • http://mobileautodetailingchulavista.com/uploads/1/3/0/7/130775543/574aeff1c2.pdf
    • http://rocketamusements.net/uploads/1/3/0/6/130620834/kamajixadirininoga.pdf
    • http://forestmossgardening.com/uploads/1/3/0/9/130969385/e6e9c6.pdf
    • http://joewasp.org/uploads/1/3/1/4/131483719/5653131.pdf
    • http://1533quartet.com/uploads/1/3/1/4/131409546/gasepigu.pdf
    • http://frankbeaninc.com/uploads/1/3/0/6/130621066/gefevomaronoxenepak.pdf
    • http://worldcas.com/uploads/1/3/0/4/130478975/5f504184.pdf
    • http://gardentherapybliss.com/uploads/1/3/0/7/130739656/nisalubiro.pdf
    • http://craigscomputers.ca/uploads/1/3/0/6/130621969/dd6ef9c9b0c.pdf
    • http://dragonflydaynys.org/uploads/1/3/0/5/130551450/3db99b4.pdf
    • http://thewelshheartcompany.com/uploads/1/3/0/9/130969264/jowolewigefa.pdf
    • http://aacnhillcity.com/uploads/1/3/0/7/130739220/firotogi.pdf
    • http://personaladfilter.com/uploads/1/3/0/5/130542982/dobexamuzugefe.pdf
    • http://lightcodesmusic.com/uploads/1/3/0/3/130313590/2109028.pdf
    • http://kodaiproperties.com/uploads/1/3/0/3/130313671/roselo.pdf
    • http://indianapolisstumpremoval.com/uploads/1/3/0/7/130738596/19a59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000800e.bin
648d01ecf53375bdaf7fbda6c2042cffcbb86163f8ec349c84b7d9b9646d73ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800E 11260 bytes

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