Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cf1e8ea748dec0…

MALICIOUS

PDF

36.4 KB Created: 2020-05-14 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 001297c61f66f72fdd7989120e1d92b4 SHA-1: 1c1ec18890f67ac3a9f6da89621704f2df23e82c SHA-256: 11cf1e8ea748dec0a994579d92b7ea670603a9c36d776f7beca13ece3d4257eb
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample exhibits multiple high-risk heuristics, including a link farm of 30 external PDFs and a link to an algorithmically-generated URL, strongly indicating a malicious intent to redirect users to potentially harmful content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://burleypta.org/uploads/1/3/0/6/130640175/130640175.html#lined+loose+leaf+paper+pdf
    • http://zionfaithmbc.org/uploads/1/3/1/3/131380063/gubibukigok.pdf
    • http://playpokeronlineforrealmoney.com/uploads/1/3/0/3/130323527/vivuzubilutit.pdf
    • http://rapidcityroofrepair.net/uploads/1/3/1/4/131437867/gosazepaverozat.pdf
    • http://anniesimagination.com/uploads/1/3/1/6/131637384/tujozisafezi.pdf
    • http://godsofhavoc.com/uploads/1/3/0/2/130272898/7757997.pdf
    • http://havefunforkids.com/uploads/1/3/1/3/131384113/xeloze_fuvazunotewakew_jugitagubivef_rituvorig.pdf
    • http://ltylogisticaterrestredeyucatan.com/uploads/1/3/0/2/130271201/fovajavekepovezibap.pdf
    • http://yantrapedasi.com/uploads/1/3/0/4/130476878/6565516.pdf
    • http://moodreap.com/uploads/1/3/1/3/131379856/xuwubapuduk_laxotenafa_sufud.pdf
    • http://fridgesense.com/uploads/1/3/1/0/131070186/8321639.pdf
    • http://channelingthelight.com/uploads/1/3/0/5/130589199/461dc690c36d82.pdf
    • http://greenspringhome.com/uploads/1/3/1/8/131856109/6250772.pdf
    • http://mypsyblogonline.com/uploads/1/3/1/4/131438823/vazifawizizi_vejaw.pdf
    • http://beaufortbeautybox.com/uploads/1/3/0/5/130551369/zozaju-variripelu-vupidujopun-muwise.pdf
    • http://imaginoia.xyz/uploads/1/3/0/8/130873996/resolobemime_govoxaxezode_bexomu_gaxipojapade.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_off0000610f.bin
6ec2d2d846a2c43bee1df9a1f63dec6cf09c0364f4b4085621c58d2f058105bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 10728 bytes

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