Malicious PDF — malware analysis report

Static analysis result for SHA-256 132c0c9486364de3…

MALICIOUS

PDF

47.3 KB Created: 2020-08-28 07:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5472bbe8d9db2055d778b578e6eb0636 SHA-1: ff91e1dafc89ea0f519b4b8f17d35a8724719dd9 SHA-256: 132c0c9486364de3b8b82398ac2fe13542775eb4e8699cd94bdcfea9fbbdd741
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to IELTS writing samples and the malicious URL. This suggests a phishing or scam attempt, likely using the document as a lure to drive traffic to malicious sites.

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=ielts+writing+task+1+answer+samples
    • http://zukiwo.9applesgame.com/uploads/1/3/1/4/131482995/sijotupikitubu-vumelu-zuniwosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/dragon_pickaxe_osrs_ge.pdf
    • https://cdn.shopify.com/s/files/1/0459/5656/3103/files/free_chinese_restaurant_menu_templates.pdf
    • https://cdn.shopify.com/s/files/1/0462/2893/0711/files/jira_service_desk_report_on_dashboard.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/pexubibuluzerofaganuju.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/merilujozukajafepoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/defikut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/mowogaxafete.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/tilifovoxijusifuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5123/files/30749636823.pdf
    • https://cdn.shopify.com/s/files/1/0434/6419/6256/files/xufasule.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_off00007a9a.bin
0d177dc6dc7c71e81c85d1d70e29d348eb7c6d037221204aea6b83fab12533e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9A 5284 bytes
font_01_sfnt_off00008c93.bin
41a12618c790a99c970603e198329c9033fbfd2507c43d0579f97249b6751188
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C93 10516 bytes