Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3e976f921d8a29…

MALICIOUS

PDF

36.3 KB Created: 2020-08-17 13:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba4a584456f5578285e7be7dbf64423 SHA-1: cb152befffddd56cba7574ac00c2b0e99b8b4c59 SHA-256: 5a3e976f921d8a2923f37397f53d6650b8dea7b06a3d737a9aa41703bde1ef9c
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 14 external PDF files, with the primary link directing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=adding+est+worksheet+ks1'. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise the malicious intent and potentially deliver a second-stage payload.

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=adding+est+worksheet+ks1
    • http://files.silvercloudvape.co.uk/uploads/1/3/2/7/132741045/8473289.pdf
    • http://files.duncannonaog.com/uploads/1/3/1/3/131380688/widaxubodek.pdf
    • http://files.kmgartist.com/uploads/1/3/2/6/132681443/lufalubagipoza_ropip_poxenisobe.pdf
    • http://files.mullwildlife.co.uk/uploads/1/3/1/0/131070581/8598a0f72ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/noliwapalare.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/wapking._in_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/fuji_film_simulation_lightroom_presets.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/imagenomic_portraiture_2_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/rafibisipabepadexikugo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/red_black_tree_implementation_c.pdf
    • https://cdn.shopify.com/s/files/1/0438/5787/1008/files/list_of_perfect_cubes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2415/files/4105924891.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/10563507877.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044f3.bin
62674417b46e14c8e8a96316a240585b2f64e1bdeb30b733a01731df342acb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44F3 4832 bytes
font_01_sfnt_off00005569.bin
b3dc5eb099ea81723093c3486595c0fa233c7e4c9cb51ce7a27b0267e8ff796b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5569 9600 bytes
font_02_sfnt_off00007642.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.