Malicious PDF — malware analysis report

Static analysis result for SHA-256 595a8d3dec47c438…

MALICIOUS

PDF

52.3 KB Created: 2020-08-23 03:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f471c382348c407a14d2ccb7f4298554 SHA-1: 299de9d9e8554ce4d6222323ca18d0919eb925aa SHA-256: 595a8d3dec47c438c6d3eef6c92cf153400f5f9d4d9f9beaf7fdfec786c8c8d0
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=5e+fighter+build+guide', points to a known malicious redirector. The document body, though partially corrupted, also contains this URL. The presence of a link farm and a redirector suggests a phishing or malware distribution attempt.

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=5e+fighter+build+guide
    • http://navovuzud.ndsucceed.com/uploads/1/3/1/6/131636665/xivivunipojazokupaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/tezosijuxed.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2321/files/3149345669.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/57631876904.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/vunibaxezatiwetituzu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3481/files/wanowibotelev.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/cardioversion_farmacologica_y_electrica.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/88081442169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1812/5465/files/joxutuzevabun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/76386933877.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/verixapexugokuvebase.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/jaxatubisavuvewu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082cb.bin
007a7370cc70f7b67a4ac6744dd2718d230478aeab9b2bc9ca0dbf987700ae5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CB 4616 bytes
font_01_sfnt_off0000928b.bin
1111eaa9cb167b0f9b2e8fb28f7e2493e8a471e6dc5fcbd3cb28521a3856ffb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x928B 10604 bytes
font_02_sfnt_off0000b645.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 4324 bytes