Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7e426651aee8b4…

MALICIOUS

PDF

46.2 KB Created: 2020-08-24 06:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7edddfbe07f041ef26c5b95e8ce5fe7 SHA-1: fe3f39b70b9ac7e6b5779491cb1e42fc01e2b2a9 SHA-256: 1b7e426651aee8b477d2b6acd907c6ea26a515a3b01711a2d773a81b3104be6f
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=capitulo+1b+realidades+1+answers+1b-+6', which is flagged as a malicious redirector. The majority of other links point to Shopify domains, suggesting an attempt to leverage legitimate platforms for hosting content that redirects to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated.

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=capitulo+1b+realidades+1+answers+1b-+6
    • http://bibena.idahoflyer.us/uploads/1/3/0/7/130775162/2422fb2fa34bf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/61038869983.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8437/files/the_bare_necessities_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/payment_plan_form_for_irs.pdf
    • https://cdn.shopify.com/s/files/1/0435/3543/3887/files/being_human_uk_season_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/13647095738.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/37382523193.pdf
    • https://cdn.shopify.com/s/files/1/0434/0793/3603/files/inorganic_fertilizer.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/81695172634.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/ca_ipcc_law_amendments_for_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/porsche_911_workshop_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/rake_db_create.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/phonetic_alphabet_for_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0436/1116/0739/files/ropobovutotoxefub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/reinstall_windows_defender.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/15616887605.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_off0000753f.bin
d6e4afeb4e78cb45706b2faed4985530b8eb7f879eb575156ae77ecb85ac3fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753F 5328 bytes
font_01_sfnt_off0000877e.bin
0994bbc8453d17e3a09dbff20e04cc6aef9cded7c5ac5743021935b5309aacb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877E 10652 bytes

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