Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3ce4542db3e1c…

MALICIOUS

PDF

37.3 KB Created: 2020-03-24 05:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1eb18f250cc9f605a1f009f98a6bf4ce SHA-1: ff6fc5c26eb351eae4a98bf9b03088b7f0bf079a SHA-256: 43b3ce4542db3e1cfdca818594d4ed5a71b1ce71a6659f8daa5d2bba32e1882d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern appears to be directing users to a multitude of potentially malicious or SEO-manipulated websites.

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://irieint.com/uploads/1/3/0/6/130621004/130621004.html#pray+for+you+ukulele+chords
    • http://solrup.info/uploads/1/3/0/4/130483603/rumorewadutetoj.pdf
    • http://702.bpmtc.com/uploads/1/3/1/0/131071286/wikiwepukafata.pdf
    • http://azlandscapers.com/uploads/1/3/0/8/130874042/c4ebaaf6420308.pdf
    • http://salonfiveseventeen.com/uploads/1/3/0/2/130287735/xepuriniboweretip.pdf
    • http://plausify.com/uploads/1/3/0/8/130813084/377ce7b9f2a402.pdf
    • http://fold-design.com/uploads/1/3/0/3/130379718/9794297.pdf
    • http://smokeandmirrorspi.com/uploads/1/3/0/6/130640048/mufugupeposetesa.pdf
    • http://erinlee808.com/uploads/1/3/0/9/130969944/nupejoremafokizize.pdf
    • http://simplelivingsolutions.org/uploads/1/3/0/9/130969492/7787772.pdf
    • http://electcedricfloyd.com/uploads/1/3/0/5/130590203/4188592.pdf
    • http://distinctlynow.com/uploads/1/3/0/2/130270917/23f425be838.pdf
    • http://ashish-jain.me/uploads/1/3/0/2/130274371/403916.pdf
    • http://msmask-bareford.com/uploads/1/3/0/7/130740055/fefipexadabebonexu.pdf
    • http://potpipeplus.com/uploads/1/3/0/3/130323174/8565214.pdf
    • http://teaandknittery.com/uploads/1/3/0/2/130270866/gaduju.pdf
    • http://hostmaster.totalmarinegippsland.com.au/uploads/1/3/0/7/130739062/lipopinat.pdf
    • http://wegro.us/uploads/1/3/0/5/130550993/sixaki-rijuxajiwoko.pdf
    • http://macleanphysio.com/uploads/1/3/0/7/130739553/saxigijibon.pdf
    • http://vibeprod.com/uploads/1/3/0/9/130969448/ximabalubudepinopub.pdf
    • http://buildtheyoungbench.com/uploads/1/3/0/4/130435875/2df60e4dcab.pdf
    • http://bellovaporizer.com/uploads/1/3/0/7/130776508/4d423b5878ec71.pdf
    • http://alchemystudiosalon.com/uploads/1/3/0/4/130476168/41530794f18c.pdf
    • https://www.amchords.com/chords/6143400
    • 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_off00006b2c.bin
c957efae4d067075ffbf5b28106ba2350b6e307ab9b99b28cada0009f89cc196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2C 7180 bytes

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