Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8a924fea48eacb…

MALICIOUS

PDF

41.7 KB Created: 2020-08-10 05:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a4be30d491566a259546064795a9806 SHA-1: 35d9ef389758dad557291142194f69148d231195 SHA-256: 0d8a924fea48eacb81f03c0e9b692c0d2fd08755e5ffe9b06ea9ed6a5759cbb5
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The document body and embedded links suggest a lure for downloading files, likely to facilitate further infection. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector and a large number of external PDF links.

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=basic+information+about+computer+pdf+free+download
    • http://files.ncpastoralcounseling.org/uploads/1/3/1/1/131163957/veduran-wenemip-siwokikiba.pdf
    • http://vafilu.tobiascwong.com/uploads/1/3/2/8/132814930/sogowunuko-pedarelokuwi.pdf
    • http://kodebute.carteraccountingandtax.com/uploads/1/3/1/0/131070420/5afa4cb82c1.pdf
    • http://files.fastlanenitrous.com/uploads/1/3/1/1/131164479/9187223.pdf
    • http://diwolago.raemiz.com/uploads/1/3/1/6/131636655/romutid-rikamafat-nipuwu-xeridiluzuxikix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/bulupakojevifepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/38449996071.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/27095685027.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/zepob.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/20524598903.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/truman_capote_in_cold_blood.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/simunotasawonu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/19050870259.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/93537643690.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_off000064bb.bin
d07b4f28938bd2ebab7ef97b63e6819b8e770abda1f423153b46cd6fe2174eb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5580 bytes
font_01_sfnt_off000077a9.bin
87b63f3eaa7606116ab47d49e72709f047f53107ec20eed87fbaac3c1561dac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A9 9992 bytes