Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2a969ae9b31039…

MALICIOUS

PDF

42.1 KB Created: 2020-08-04 23:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ccb881e86ff47e1953e188188aec828 SHA-1: fca144ec419f4cd015b6cc1ca8ae498d43d4f0c5 SHA-256: 0b2a969ae9b31039f8d10d5a47987d9d0d3428a0a8cabf410fd5824fec6ca4d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector URL that is flagged as malicious. The document body, though partially corrupted, suggests a lure related to 'assessment center training'. The presence of numerous external PDF links, including a link to a known malicious redirector, indicates an attempt to drive traffic to potentially harmful content. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a malicious intent to redirect users.

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.cc/pify?keyword=assessment+center+training+f%25C3%25BCr+f%25C3%25BChrungskr%25C3%25A4fte+pdf
    • http://files.stephanieseguino.com/uploads/1/3/0/9/130969428/7ba0495ed.pdf
    • http://files.crinancanalcottage.com/uploads/1/3/1/4/131409574/jixewuk-luwudewis-wojuwewep.pdf
    • http://files.peacecitysoaps.com/uploads/1/3/2/3/132303045/sixaxubijekim_bufis.pdf
    • http://files.ashleyelich.com/uploads/1/3/1/3/131381976/xevimur-tukikumavu-mixadunatuka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/sijafadisuremimiwej.pdf
    • https://cdn.shopify.com/s/files/1/0434/8788/7526/files/72117390467.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/60967792292.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/90575369843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/95361383731.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/katigofawinujeba.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7566/files/22733073686.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/goruf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/11448498508.pdf
    • https://cdn.shopify.com/s/files/1/0430/6875/2023/files/wotopilatijivenofaneg.pdf
    • https://cdn.shopify.com/s/files/1/0438/3784/9762/files/linoneguwarufug.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c1.bin
f44fbed7669cea0ad07bea2d93c967488c3aff0e9c37a6ac827e77ad64e3519a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 5944 bytes
font_01_sfnt_off00007607.bin
195b47484efb821567ae1ed645b00b34166a0fbfa532ba91024f3cb2215e9826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7607 10528 bytes

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