Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e93aae5b5bee6e6…

MALICIOUS

PDF

41.7 KB Created: 2020-08-25 19:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c976391c433ef6483db2714479f93931 SHA-1: 4ca640f0d85732e385d460b1b4663b1a84090d36 SHA-256: 3e93aae5b5bee6e61e24428b6767307a51a9ab6660c5bc147de7ec137966c7a7
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains. The primary malicious URL identified is https://ttraff.com/pify?keyword=alternate+exterior+interior+angles+worksheet, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=alternate+exterior+interior+angles+worksheet
    • http://files.suekodress.com/uploads/1/3/1/4/131408502/guzog-bofexezug-gugifiwur.pdf
    • http://files.nealyibclc.com/uploads/1/3/0/8/130873921/jogetotivivuvit_jijedatovifaj_xudanoga_gexesakoxajon.pdf
    • http://vuxokeju.eastpauldingyouthfootball.com/uploads/1/3/0/8/130874575/6e8733e206103.pdf
    • http://files.thewoodroom.co.uk/uploads/1/3/2/6/132696111/6626683.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/85299032891.pdf
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/zavotikibefiropux.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/90820505344.pdf
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/fevofesonenumelovoxesivun.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/jingle_bell_song_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/foferenalodulewoxos.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/vurudu.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/
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/vuru

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d4.bin
10e053eb515c563d0b975732f2c6947fc3d936898f02eed44d864661bae8cc54
pdf-font-stream PDF embedded font (sfnt) at offset 0x64D4 5160 bytes
font_01_sfnt_off0000766d.bin
54f9d949aec1c9ec043c90305dee8a6282f09bea9ed650795aa7842d9ff23d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x766D 10320 bytes