Malicious PDF — malware analysis report

Static analysis result for SHA-256 44756b0f50ff6da0…

MALICIOUS

PDF

36.7 KB Created: 2020-08-06 04:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecbca062263a1ce8108bc5f50b9b8f88 SHA-1: a37ec2577e2714dd496b11b33f5b45ecef29f060 SHA-256: 44756b0f50ff6da00d8bee23507a6388799ea6f05d4b4bfa28cee0eda1acc8de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one to a known malicious redirector at `ttraff.com`. The document body and embedded links suggest a tactic to manipulate search engine results or lure users into downloading potentially malicious content disguised as free books. The ML classifier strongly supports the malicious nature of this PDF.

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=bob+ong+books+pdf+free
    • http://files.declaringzioninternational.org/uploads/1/3/1/1/131164520/lorurujoneja.pdf
    • http://files.gcsexpert.com/uploads/1/3/1/4/131438312/gidatejos.pdf
    • http://files.legalprose.ca/uploads/1/3/1/3/131380107/5460065.pdf
    • http://files.nativetales.com/uploads/1/3/0/7/130775942/b90bae542e.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/46104449026.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/4986795657.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/xixatarijafixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46905239833.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8765/files/wagokajubamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/suluzanosamarow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9941/files/submit_form_to_web_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/vujonirowutifuvefevenegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4331/5102/files/fopopis.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/no_mosaic_sims_4.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/gogaxefoginixexanulofol.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d0.bin
71037028aeedb9cc121d594e6b6da1cf54aa582ea6bb75819e538986354aa131
pdf-font-stream PDF embedded font (sfnt) at offset 0x51D0 5220 bytes
font_01_sfnt_off000063ac.bin
4dd050231b8c3b9f66a99a4e200e284acb1d98fbc01878dc03ebaff8fd9a535a
pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 10004 bytes