Malicious PDF — malware analysis report

Static analysis result for SHA-256 8812b4c258b693d0…

MALICIOUS

PDF

70.6 KB Created: 2020-08-24 22:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147e91b04552c63cb14b5fd1f28d1ebd SHA-1: dc08a67663363dd1d9d64b951de964e97ffc4d60 SHA-256: 8812b4c258b693d0524d0d43c3bf7325e1b6d907355c4e9d084f1a905bba1a79
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a complaint letter template. This redirector likely leads to further malicious content or exploits. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

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.com/pify?keyword=template+complaint+letter+for+poor+service
    • http://files.natureworld.com.au/uploads/1/3/1/3/131379439/woketurip.pdf
    • http://kuwule.kesara.org/uploads/1/3/1/0/131069934/kemufewotuvemiwij.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/nugedusoxoluserajabiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/pikeru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81579197248.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/smart_shankar_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/1413985276.pdf
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/17427187365.pdf
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/50493014865.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/robifofelegivojiguresi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4333/8912/files/anomalous_behaviour_of_water.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/tijaredubafaluduligam.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/p_c_v_ka_full_form.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_off0000ce2a.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 2828 bytes
font_01_sfnt_off0000d824.bin
f8a945e0962678be89300ec8580c4f13c9d8fb5aab7a79cec0a4bd523064fb16
pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 5168 bytes
font_02_sfnt_off0000e9ab.bin
b3dc5ef6df14a0e48d9a060b0dc2dac023a8ce538434a6995dc1d016bd4422e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10356 bytes