Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9d695f93056f71…

MALICIOUS

PDF

37.8 KB Created: 2020-08-19 13:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceeadd34dc30a59a38e9dbe098ecff42 SHA-1: 1759aeafe94a7ee3d657b13b07539bd8804df9b8 SHA-256: 8e9d695f93056f713cdba7200f5e6118f59bb8ae655c716cf091d47dd13444a6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a redirector link to 'ttraff.cc', which is known malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Salesforce hashtag report' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=salesforce+hashtag+report
    • http://files.holyangelsnj.org/uploads/1/3/0/7/130776255/tibagunabiw.pdf
    • http://files.seymourwildlife.com/uploads/1/3/1/6/131606169/6831258.pdf
    • http://files.camelliacharlesjewelry.com/uploads/1/3/1/4/131453018/wixalejujus_zemor_lulifob.pdf
    • http://files.bodycareclinicriverside.com/uploads/1/3/0/8/130814340/nezatolijezivaxajak.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/21700298439.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/happy_birthday_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93867881616.pdf
    • https://cdn.shopify.com/s/files/1/0436/7787/6377/files/weladojogegipawaruxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/architecture_design_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/blades_in_the_dark_portugues_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/effective_academic_writing_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1778/files/kafakagiwuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/buku_al_quran_dan_sains.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/lobisesopuzagozeniko.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054e9.bin
b01f2c063b3bf97e437bcc5a7ea9385538ca1f5d7ff37543b76ddd2021b7c194
pdf-font-stream PDF embedded font (sfnt) at offset 0x54E9 5380 bytes
font_01_sfnt_off0000672b.bin
0e7acee6af54c828d847f5baaaeaaab48b4e418bb3eba62f5adec9bb34ad6aec
pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 10280 bytes