Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afed5bf442be068…

MALICIOUS

PDF

45.6 KB Created: 2020-08-21 23:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 891973d1375b2aa803f71705802b0d87 SHA-1: cc5f80b1ebb602f401c436ffd110ac75c32b564e SHA-256: 5afed5bf442be0684d3deccc0580db91ac9cc4ae6053c3b0408a781dba2647f4
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to 'deduction guides' and includes the malicious URL, reinforcing the lure. The presence of numerous links, including those to potentially benign Shopify domains, indicates a link farm or SEO poisoning tactic to distribute malicious content.

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.ru/pify?keyword=deduction+guides+c%252B%252B+17
    • http://files.afinoentertainment.com/uploads/1/3/0/8/130874276/77bd63da9661f.pdf
    • http://rikako.pipekeepers.org/uploads/1/3/0/8/130813612/7648218.pdf
    • http://files.floridacda.com/uploads/1/3/1/3/131398036/3775610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/45785803956.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/cataloguing_tools.pdf
    • https://cdn.shopify.com/s/files/1/0432/7954/8574/files/65498295413.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/48227605995.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/zezamirudixibujit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/bovose.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/properties_of_hydrocarbons_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/41870986180.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/72035876721.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.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_off00006baa.bin
d09acd6f37282562b2e33432089da66acf9e7887d52639401cded4a86107cc11
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAA 4900 bytes
font_01_sfnt_off00007c79.bin
6efe0ba3cf0dfa132b77f3718b22803b162b063c72c5e7412cf29323f3bd3edc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C79 14264 bytes