Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f25eb9b995922e9…

MALICIOUS

PDF

38.7 KB Created: 2020-07-22 20:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a19f3047a5371c30b9f533352f984b SHA-1: ca1a730a0e7abed969dcb379750885da5ea3fe58 SHA-256: 7f25eb9b995922e9c817cc320f8ce32693666fe3db9f8b0f15989b6e07c30f38
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is a redirector that likely leads to further malicious content or malware.

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/wb?keyword=information%20technology%20for%20management%20muthukumaran%20pdf%20download
    • http://files.bertingelaere.net/uploads/1/3/1/6/131606619/4234185.pdf
    • http://files.ocsa-cc.com/uploads/1/3/1/8/131856288/f0460f7c.pdf
    • http://files.kholabakso.com/uploads/1/3/0/7/130775556/7497996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/nober.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/38654455851.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/nazezirivuloro.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/63824210508.pdf
    • https://fatavavosu.files.wordpress.com/2020/07/suwugolew.pdf
    • https://juvolezo.files.wordpress.com/2020/06/fivivobijezojev.pdf
    • https://podanowusotu.files.wordpress.com/2020/06/64672112313.pdf
    • https://desesab.files.wordpress.com/2020/06/83508149793.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/53754772239.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/35678894788.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/47690006198.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/13243285805.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0305/files/58993199358.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/soxupofibimelesupogi.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_off000058e2.bin
8e3b7fc33ff8878de6efdbae00c107ff6bf6ed185f73b26999f2e13aa416e1fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x58E2 5468 bytes
font_01_sfnt_off00006b5d.bin
51c8bbb9eca454fa60dda6b3421e68b53692645ef8b8df87223536aff1282a32
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5D 9896 bytes