Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c623fa15a47ca4c…

MALICIOUS

PDF

45.2 KB Created: 2020-08-24 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f5119d1c2f015d7a07d20e0234f723 SHA-1: 21283ed46bbf54701482be416a04736700a7b12f SHA-256: 8c623fa15a47ca4ce9cf907c5842aec2901697996f014392c1fff30ec1cb593c
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a search result for a specific document. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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=surah+yasin+full+pdf+in+english
    • http://files.wildwombinwellness.com/uploads/1/3/0/7/130776592/zudofezijozu-sokarit.pdf
    • http://files.littleflowerrugby.org/uploads/1/3/1/6/131637125/degivatu.pdf
    • http://files.chianannlu.com/uploads/1/3/1/3/131380985/07ab156fe366555.pdf
    • https://cdn.shopify.com/s/files/1/0430/1812/5465/files/melissa_rauch_nip_slip.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0025/files/loyalty_program_business_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/22425817156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/47425082372.pdf
    • https://cdn.shopify.com/s/files/1/0443/2723/9836/files/tinkers_construct_thermal_inversion.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/original_star_trek_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0440/5500/3286/files/lugibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/mantra_biometric_device_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/21235656216.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/raguforumedatokogu.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_off0000727c.bin
0395d9781825da5741770644a0ce50f6d7d141cfce6ea6e7cf032c83b0058840
pdf-font-stream PDF embedded font (sfnt) at offset 0x727C 5508 bytes
font_01_sfnt_off0000853c.bin
39596e43ccd070921239d5091929bae6e4da29fee78455ac3e1c024ec9b779d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x853C 10136 bytes