Malicious PDF — malware analysis report

Static analysis result for SHA-256 20838e1cea06ce70…

MALICIOUS

PDF

57.8 KB Created: 2020-08-22 10:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c5c8f558eb1c0e84ae4c94468c28df SHA-1: 6b5216ba8e85ecdfdf29f215eadf5d670b3285da SHA-256: 20838e1cea06ce702ad98de01aefa2e02709289b3ffbe33e750224e11be4fbcc
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. One URL, 'https://ttraff.ru/pify?keyword=rune+factory+4+fishing+guide', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an intent to redirect users to potentially harmful content or further distribution points.

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=rune+factory+4+fishing+guide
    • http://zuvuraje.nwhornsociety.org/uploads/1/3/0/7/130776760/722e53118ff.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/zegalixukiwip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/baxukawurasur.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/93190099647.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/kibibodorapiradapa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/2nd_edition_d_d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gopag.pdf
    • https://cdn.shopify.com/s/files/1/0441/2299/6888/files/beautiful_wallpaper_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7038/files/jetufik.pdf
    • https://cdn.shopify.com/s/files/1/0447/2432/2460/files/67243041509.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/carol_dweck_mindset.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6210/files/columbia_paw_print.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079ed.bin
f02174369f4f0414a94010f6ff97f1c27d3f7f61e1916f7960f9f45f84ec0dc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x79ED 2984 bytes
font_01_sfnt_off00008474.bin
d8d90f7cc996f60d1156bcdc0d0f5197ffccebac48cc264d0181d2278b814f96
pdf-font-stream PDF embedded font (sfnt) at offset 0x8474 5448 bytes
font_02_sfnt_off0000970f.bin
8ac2e650a2207a36c5fea072edba935dc675b8cfe55d0e8bbbe96880bed492cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x970F 14616 bytes
font_03_sfnt_off0000c4d6.bin
152c00a0bf9923e5233c71f5ca47b19567fbad88cb6995bd61775ff038e1894a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 16148 bytes