Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deff2735fac866d…

MALICIOUS

PDF

35.3 KB Created: 2020-08-10 08:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aabeaba184b1dc3f035acc2acdb15d7 SHA-1: a595ea998129716561488ce5f61b322b71b9af49 SHA-256: 5deff2735fac866d6953888e6438663e4a9cfad8b24bc264e330c07dfeb2efb1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=merriam+webster+rhyming+dictionary+pdf'. This suggests a phishing or scam attempt, likely using the guise of a dictionary resource to trick users into clicking the malicious link. The presence of many external PDF links also indicates a link farm, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=merriam+webster+rhyming+dictionary+pdf
    • http://files.centralflhomeeducationservices.com/uploads/1/3/0/7/130776460/dapefuwis.pdf
    • http://files.spacentral.net/uploads/1/3/1/0/131070192/jezolix.pdf
    • http://nowusoro.redclayphotography.org/uploads/1/3/0/7/130776167/aa5d4e5beab0c28.pdf
    • http://pomor.missionhilldental.ca/uploads/1/3/0/7/130775934/tudoxamiteloze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/the_carries_diaries_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/a_story_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/rujevefidudojulategazipo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/49219267655.pdf
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/gelativipijakumep.pdf
    • https://cdn.shopify.com/s/files/1/0434/3994/7932/files/paramount_bank_po_books.pdf
    • https://cdn.shopify.com/s/files/1/0439/4926/0968/files/x11_connection_rejected_because_of_wrong_authentication.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/kp_astrology_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/pubiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/k_ril_tsutsaroth_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/vibew.pdf
    • https://cdn.shopify.com/s/files/1/0434/7419/0498/files/chaffoteaux_inoa_25_ff.pdf
    • https://cdn.shopify.com/s/files/1/0447/0656/2201/files/sorcerer_s_apprentice_bassoon.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a19.bin
ae5f1a5f5edbfbb7a2a972e2778e5cb9b7001359e4cbbeb9a3f7e5ed523e4d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A19 5876 bytes
font_01_sfnt_off00005e13.bin
ace28d1a27954b88f6835705cd24a20985e31486df00d00261de2dffc903f549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E13 9996 bytes

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