Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a1f9b2d41eeddc…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 11:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e13e8264704edd6cc86e138192dcf698 SHA-1: aee01a01113dbb4149d057affe5a8f068ae7de3b SHA-256: e7a1f9b2d41eeddc9248533272fc8914b860cce9eb4ac9f3ce5fed5b84dc2fe2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=sujet+brevet+sciences+pondichery+2020+pdf'. Additionally, it features a large number of embedded external PDF links, many hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially garbled, contains text related to an exam subject, likely serving as a lure to encourage clicks on 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=sujet+brevet+sciences+pondichery+2020+pdf
    • http://files.coolbullproductions.com/uploads/1/3/1/8/131871633/zarixek.pdf
    • http://fazewa.justagproductions.com/uploads/1/3/1/4/131482975/salalalum.pdf
    • http://files.nategrillscholarship.com/uploads/1/3/2/6/132682892/852e1b01dc.pdf
    • http://files.tnvolstatewinnies.org/uploads/1/3/1/4/131482884/2212147.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/60217119675.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/remorif.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7389/files/48090831413.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/borewifolavesipulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/how_to_convert_file_to_word_document_offline.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1471/files/xakisix.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/ableton_live_9_tutorial_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/filtre_quartz_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/gungeon_macho_brace.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/61453166190.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/8499951281.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/tunoxiko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.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_off00005e03.bin
5bdf50a51fcac0e1bc4b7305f665e933cdc3b9a02e66e2406a3a4c8440ebeaee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E03 5756 bytes
font_01_sfnt_off000071a5.bin
1a02017d8f9dfccebdf658a6e57aaf3f1db45e167806d7a7e54ac7b5b333925c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A5 1956 bytes
font_02_sfnt_off00007ac7.bin
6ad8f7285d15a167a1bab1649770f0cd975c410e0662b7f688767bf7501bbc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC7 9872 bytes

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