Malicious PDF — malware analysis report

Static analysis result for SHA-256 f879e89277aaf422…

MALICIOUS

PDF

34.9 KB Created: 2020-08-17 00:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d37f9a301a4bcb770bb533edd7e8285e SHA-1: 25c266a107ebb8c9d33993c5a6af798bc5efc5ae SHA-256: f879e89277aaf42207dce52f07bb898df6c9d7d3ae4e3d908570ff5386cb2bf5
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which in turn points to a URL containing 'cg police def question paper 2018 pdf'. This suggests a phishing lure attempting to trick users into downloading malicious content by impersonating official documents. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URLs are sufficient to determine the attack pattern.

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/pify?keyword=cg+police+def+question+paper+2018+pdf
    • http://kuzikis.stpaulautomation.net/uploads/1/3/2/6/132683071/wogoxolatu-bijudoze-wujuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/89551732662.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76685421079.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/9837021896.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/slam_by_walter_dean_meyers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6310/5949/files/zomowuzuwisomofutilejazog.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/xatewusajakixixovetidojab.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/femokusukanedudopiroriri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/victorian_era_powerpoint_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/runaway_bon_jovi_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/ruguxejovinokiwagek.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_off0000497c.bin
3247a4cfb52fdb827c1e238497647b71b4b7c9062f6f41bed9c8b00fb29291f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x497C 5872 bytes
font_01_sfnt_off00005d7c.bin
f00729d5a9302988e656d42a27e229d03a1d2cee7f0ee669cfc447ff2cc4a62f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 9844 bytes