Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bc1fbbe8b1a4c4…

MALICIOUS

PDF

50.2 KB Created: 2020-08-29 12:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10db688723bcbf517bc636d8b2fd24f5 SHA-1: 1f094ed862319e557453841e417b8176c145726a SHA-256: 48bc1fbbe8b1a4c400c5bec556f0687239efcfdc22546533353456d95f75c7de
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a deceptive title 'Mixed direct and indirect speech exe' and a large number of embedded links, with one pointing to a known malicious redirector at `ttraff.com`. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL, suggesting the primary purpose is to redirect the user to 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.com/wix?keyword=mixed+direct+and+indirect+speech+exe
    • https://cdn.shopify.com/s/files/1/0452/5198/5565/files/34920979567.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/faduporezowagimep.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/vadatigobazafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/rasogujusevopav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/14049041434.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d92b88587ee450aaaa20a7ded358862.pdf
    • https://static.usrfiles.com/ugd/b8c837_25f721a07d224e1392216c32a96e24b1.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6984/files/95979561891.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/16026791703.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/kefuxazapixim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8865/8078/files/87020093224.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/zikonetinujigudar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8019/4975/files/gipowawodelobonokefakep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/finger_phonics_books.pdf
    • https://cdn.shopify.com/s/files/1/0459/8398/9922/files/outlook_app_android_setup.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6728/files/lorirovopifulofu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5542/2369/files/romadaxurobugimenimasigo.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_off00008585.bin
d9f9d84872c21699af9229cd185edb1752611a805feb1606a6e18a678a4eeafb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8585 5204 bytes
font_01_sfnt_off0000972e.bin
5fa7b891a68ec2d9fb11b958a5ea1a28cddfa8761497f8aafec4fcab0ef37533
pdf-font-stream PDF embedded font (sfnt) at offset 0x972E 10656 bytes