Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff877d490eaa58c…

MALICIOUS

PDF

37.9 KB Created: 2020-08-11 20:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04dd2bfe81320c692003f4f485c7a021 SHA-1: 6ffce66ac66630af4d3fc029f80d4df7a2ba4b4c SHA-256: 5ff877d490eaa58c00e752e8fa5a31daf5ffa545184b063195b624c30268d82b
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=centum+mortgage+application+form+pdf', which is flagged as malicious. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=centum+mortgage+application+form+pdf
    • http://files.elearningnexgen.com/uploads/1/3/1/3/131380175/5564bda0193.pdf
    • http://files.simplywholesometreats.ca/uploads/1/3/0/8/130814718/zibadapapunus.pdf
    • http://files.coprocartel.com/uploads/1/3/1/3/131383478/buxube-demuwatekef-kuxepad.pdf
    • http://gulike.b-cozyhomedecor.com/uploads/1/3/1/3/131379578/5510287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/29010613694.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/tezekopab.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9247/files/xixuruvoremedozatez.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5930/files/arlington_library_fallout3.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/format_of_informal_letter_writing_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/5974/7745/files/14532308045.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/dadilobazekali.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/sasud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/sofinirifixuwikini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/20410828152.pdf
    • https://cdn.shopify.com/s/files/1/0432/8659/3694/files/jesizesopevomefik.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_off0000537c.bin
641d938d3946ba51bd35833e2090946ccd800da664a0e00a5ba76bf13192bddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x537C 5204 bytes
font_01_sfnt_off00006518.bin
50577bd19c8973320752c3b5f2070f9ed1e4dd52cd6181de4c85f20d1afe22c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6518 11240 bytes