Malicious PDF — malware analysis report

Static analysis result for SHA-256 70804b7de6f3aae0…

MALICIOUS

PDF

46.8 KB Created: 2020-08-21 23:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86d36f7d1086d46224519d4a7fafdd30 SHA-1: 087f3a2f6c33bef3163c8a83da806197a1c289c8 SHA-256: 70804b7de6f3aae07495d7adbdc8a936979a1f79a6acd1a50aea3036b697dcd9
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text related to interview questions and the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites.

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=nurses+interview+questions+and+answers+emergency+department
    • http://pasobedo.crossandcoboutique.com/uploads/1/3/0/8/130813650/wejepep-bojewena.pdf
    • http://suxatomov.jumpline-group.com/uploads/1/3/0/9/130969572/2619859.pdf
    • http://files.csulbmie.com/uploads/1/3/0/7/130740571/4819928.pdf
    • http://fogirizax.mitchadvent.com/uploads/1/3/1/6/131637046/tajujisokifa_gojedomobeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5486/6337/files/kopaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/38264812893.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/marriage_anniversary_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/kubop.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/77314445382.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/tasawuf_al_ghazali.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/sovuwipu.pdf
    • https://cdn.shopify.com/s/files/1/0444/2020/2663/files/beer_belly_or_pregnant_belly.pdf
    • https://cdn.shopify.com/s/files/1/0448/7803/7159/files/zegegekametibazunodutaxox.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7863/files/62739705686.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/fulubezu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/niredulopufijukenove.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/kuxusirafajutuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/green_revolution_essay.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7904/files/sexekobiwatedek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069e5.bin
2fe5fe4d89a717629a01a97de6d04222712bbc97bd6439a522852ff9bb81b693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E5 5592 bytes
font_01_sfnt_off00007ce7.bin
ccb9cbbf4751fd31e208ba34415db7c4976dcc5e63f5acef09ab709026f3965c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE7 10208 bytes
font_02_sfnt_off00009f55.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F55 4324 bytes

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