Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efe3ca60c190e09…

MALICIOUS

PDF

38.7 KB Created: 2020-08-18 17:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38eb0f4f162b6f57047a7d434a6b937f SHA-1: 79c7fd567f38746c407c8fa505c20676600759a7 SHA-256: 5efe3ca60c190e09b35786effb65456a7405247dc5670a294dfe81e8bc6ba1b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=amalgamate+pdf+files', is flagged as a malicious redirector. This suggests the document's purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the attack.

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=amalgamate+pdf+files
    • http://files.crookedarrowpress.com/uploads/1/3/2/7/132740412/gawatunagot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/aulularia_testo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/mid_night_club_cheat_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/62049052916.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/5733674025.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/dfl_bundesliga_spielplan_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5224/files/ameloblastoma_histopathology.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/dmv_sample_test_ca_2016.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/tisit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7050/4608/files/shankarachi_aarti_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/pressure_gauge_calibration_by_dead_weight_tester.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a7a.bin
00989f3c41804d13725ef1db6cbcd67f6f706baf35f167fd2b0a47c5a09c5a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7A 5256 bytes
font_01_sfnt_off00006c4a.bin
627b12105c26dfee49d623a2edfbca23e086ed45eba0ca075efb057796a7ab1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4A 10088 bytes