Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a1a874a205cbff…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 21:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80bdfb50c6c4d4fbff5f80d5a69ca06 SHA-1: 1835b5785061ee6891352965f7a819260a2f2205 SHA-256: e9a1a874a205cbfffa17660415fbf29c53b86bd8fa32a0316c0f7882a647807a
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=ac+market+apkpure+old+version', is flagged as a known malicious redirector. The presence of this redirector suggests the document's primary purpose is to lure users to malicious sites, potentially for phishing or malware downloads. The ML classifier also strongly indicated maliciousness.

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=ac+market+apkpure+old+version
    • http://files.beso.co.nz/uploads/1/3/0/7/130738554/xamobaligupawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/42712994358.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/53682694124.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/phd_personal_statement_sample_uk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8489/files/financial_report_explained.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/animal_farm_book_review.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/davogepekuletox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2678/4157/files/jazipevaxuvabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8284/files/kant_and_the_problem_of_metaphysics_heidegger.pdf
    • https://cdn.shopify.com/s/files/1/0463/2533/4171/files/properties_of_addition_worksheet_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0451/2713/9482/files/30933650970.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/brochures_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/86354048638.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_off0000756b.bin
c7dd2145f44f22f8e18d5545877c909e1a8f9979445d60324d3d826424d0fa02
pdf-font-stream PDF embedded font (sfnt) at offset 0x756B 5332 bytes
font_01_sfnt_off0000876f.bin
70501cda5063533423c5943147061e839fad745b7bb5cfb03f98d0465266a3d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x876F 10216 bytes