Malicious PDF — malware analysis report

Static analysis result for SHA-256 3716e33f4d776d5f…

MALICIOUS

PDF

36.2 KB Created: 2020-08-14 11:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af760bf31a134d6446f5a30932843d1 SHA-1: e03d6fd2807a0c6261aaab0f335de36b725f3254 SHA-256: 3716e33f4d776d5fc45ae3fee824c1a135f85311452778716e84d25823d9ca31
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to improve SEO, with one of the links pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=exterior+angle+of+triangle+worksheet', which is flagged as malicious. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, and the PDF structure itself did not reveal specific exploit techniques beyond the malicious link.

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=exterior+angle+of+triangle+worksheet
    • http://files.stephenwitkin.com/uploads/1/3/1/4/131437983/8d0197aa.pdf
    • http://donur.ballsmillssoccer.com/uploads/1/3/1/6/131637316/7054356.pdf
    • http://files.jason-w.com/uploads/1/3/1/4/131437626/d4f5e9.pdf
    • http://files.bravemansuitingco.com/uploads/1/3/0/7/130738548/kunerezotaxi_pojipapimo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/free_printable_blank_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/bmw_118i_technische_daten_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/ap_grama_sachivalayam_digital_assistant_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/entrepreneur_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/tazidi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5845/files/cub_cadet_rzt_50_parts.pdf
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/abacavir_hypersensitivity_case_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/holt_chemistry_textbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9576/files/calculus_3rd_edition_strauss_bradley_smith_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/58668926422.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/59867297402.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/cash_flow_analysis_example.pdf
    • https://cdn.shopify.com/s/files/1/0447/8582/7991/files/estimation_and_costing_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8791/1319/files/sepowaxejasazodaxame.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_off00005085.bin
6a4f15ff4c0e7dd24ca548a3697523ae733383d873eb6ea4b57881d2664778a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5085 5212 bytes
font_01_sfnt_off00006254.bin
3284a3127bf085b1631cfeb9df5ab919c46eb65fd0faff25b39d451dba1ab2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 9832 bytes

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