Malicious PDF — malware analysis report

Static analysis result for SHA-256 a461727f14471cf2…

MALICIOUS

PDF

62.8 KB Created: 2020-08-04 12:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7da52caff283a1248df75dca396f079 SHA-1: f8d5bb1411e5a46208bad2f9bcd393b29fb5a2e9 SHA-256: a461727f14471cf20f3c0f663d7fa896e5299cc1cbc5ed0f5c267d6862c5e45b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Adjektivdeklination Übungen pdf mit Lösungen', suggesting a lure for educational content. The primary malicious link is https://ttraff.cc/pify?keyword=adjektivdeklination+%25C3%25BCbungen+pdf+mit+l%25C3%25B6sungen, which is likely used to redirect the user to a malicious site.

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=adjektivdeklination+%25C3%25BCbungen+pdf+mit+l%25C3%25B6sungen
    • http://files.katetobin.com/uploads/1/3/0/7/130776433/9807359.pdf
    • http://files.westmorelandks.com/uploads/1/3/0/7/130775921/rimafowamewebus-jemibawurule-zabiwe.pdf
    • http://files.preciousmomentslivebymichelle.com/uploads/1/3/1/1/131164009/ccf5ad95b9a5.pdf
    • http://files.burchfieldhomestead.com/uploads/1/3/0/8/130874339/jegagepot.pdf
    • http://files.beyondthelearningcurve.com/uploads/1/3/1/0/131070458/jetupabamem.pdf
    • https://cdn.shopify.com/s/files/1/0448/1833/3858/files/el_viaje_del_hroe_libro.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/50512621165.pdf
    • https://cdn.shopify.com/s/files/1/0437/2650/4086/files/75593990530.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/54607598269.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/kixagekowizunoxos.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/fuwupowaxixomef.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/89577954445.pdf
    • https://cdn.shopify.com/s/files/1/0429/5960/1830/files/74390776384.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/affichage_obligatoire_code_du_travail_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/55936285726.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a068.bin
991a0605efad65d5a7c6252e969dc1aefeb0a2e9b76496069c725123611e852b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA068 5096 bytes
font_01_sfnt_off0000b1f2.bin
08c75faf2a7425b99781f9113dd2ffdc8b81f6cd03bcaeaf621743794cf24148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 5852 bytes
font_02_sfnt_off0000c563.bin
9a09195ca83c1ba64d05c8c33ccd843343f25968899e7ebeb11a340f8194ca1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 11492 bytes

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