Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb7802b04ddb33d…

MALICIOUS

PDF

66.0 KB Created: 2020-08-17 05:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead3015a19d2ab5351529a8471274336 SHA-1: 0d48f1951f94b01df413706ec3e0ba50b1507b75 SHA-256: cfb7802b04ddb33df5a4a19530d724dae8123992413f4c7b5facbddec0e3d5cf
154 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, identified as a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=sql+server+database++2016', points to known malicious redirector infrastructure. This suggests the document's purpose is to lure users into clicking these links, which likely lead to malicious websites for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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=sql+server+database++2016
    • http://files.roxanaramos.com/uploads/1/3/2/6/132695280/048e5a1e57.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tujekozovazufurujujazer.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/mufepumugodapusipakaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/the_new_oxford_annotated_apocrypha.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/rufagixuzararak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/how_to_make_wire_in_little_alchemy.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/carrier_air_conditioner_error_codes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/67020924744.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/16866494254.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/sanguine_personality.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/82622328009.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_off0000c410.bin
ce9838eab40ea2b6b3fd77b8e5b4bd02e8c87ea757198f3cb1eab8fd6d2ecf37
pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 5728 bytes
font_01_sfnt_off0000d7a3.bin
cb320fc3bec0da8159f43e77f6c565f959f145130d88181377418ff80260bd63
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 11000 bytes