Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33e42a1617626bc…

MALICIOUS

PDF

61.5 KB Created: 2020-06-04 09:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c754160259805ad53be0d057841a6465 SHA-1: 1c794b80977588e4331c5866a1486e2267c9ce02 SHA-256: c33e42a1617626bc5af898f0b9b841647a7e2d29fe2ac0a17e7380f4ace99e27
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The presence of these links and the ML classification strongly suggest a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/wp3?keyword=current+affairs+2009+pdf#current+affairs+2009+pdf
    • http://webdisk.agropol.lv/uploads/1/3/1/3/131398194/8377285.pdf
    • http://hostmaster.salonedgepro.com/uploads/1/3/0/7/130776630/vebusopumolas_motimefiro_fufixarajat.pdf
    • http://economicsinmotion.org/uploads/1/3/0/4/130483856/xutekitu.pdf
    • http://carltonjlee.com/uploads/1/3/1/0/131070115/8f595.pdf
    • http://spotlesshousecleaningservice.com/uploads/1/3/1/3/131397983/butexorolajuje.pdf
    • http://propertypresentations.net/uploads/1/3/1/6/131637303/4152714.pdf
    • http://rosadosastros.com/uploads/1/3/0/7/130738949/8136686.pdf
    • http://cali-parts.com/uploads/1/3/0/7/130775196/2546258.pdf
    • http://mattmediaphoto.com/uploads/1/3/0/5/130589281/nekekavaduxaxobebox.pdf
    • http://fionaheartthekitchenshepherd.com/uploads/1/3/0/6/130605421/556879.pdf
    • http://jakecharronmusic.com/uploads/1/3/1/6/131607054/fibilevafifebo.pdf
    • https://fofunifoxetu.files.wordpress.com/2020/06/sukiduwuxuputewisamen.pdf
    • https://dujatozat.files.wordpress.com/2020/06/kusolanawigazoguguwowag.pdf
    • https://daxetojip161513793.files.wordpress.com/2020/06/93126165745.pdf
    • https://wordpress.com/tos/
    • https://wordpress.com/dmca.html
    • https://wordpress.com/policy.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d3.bin
b7823d732593f46bd361a9536adc2cc9aa8d67e0dd01c33bfb1984fdd5e2abe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D3 10984 bytes