Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f9a70205c2feda…

MALICIOUS

PDF

46.9 KB Created: 2020-08-19 03:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ca3c33681cbfd33d9036b2ce21d1b8c SHA-1: 93a7c3d258b760d2a3371100da4fc699835fbcc6 SHA-256: 71f9a70205c2fedaf46cdc8e7b73c50b101b3341a7ad846836d662a927d03a24
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Android apps on google play store' and a URL that appears to be a lure. The presence of numerous PDF links, many pointing to Shopify, suggests a link farm designed to obscure the malicious redirector.

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.com/pify?keyword=android+apps+on+google+play+store
    • http://bufese.desertdolphin.com/uploads/1/3/2/6/132682137/zaramasuxut.pdf
    • http://tuxidezo.jbeautyusa.com/uploads/1/3/0/8/130813747/tujub_karaxuf_bewofurixova_wowafakojaxizo.pdf
    • http://files.mobilecitynz.net/uploads/1/3/0/7/130776164/a9dcaad55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/upsssc_assistant_accountant_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1880/files/87853122293.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/71540789599.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/tawisitalatalotizuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/xuzerabe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/fuparekatefegajazat.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/2817524633.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/cisco_webex_room_kit_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/bhole_baba_bhajan_song_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/javotogatigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/kuripavabegulumosaxurifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/26279895036.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_off00007948.bin
a5ca01985aa300914bf64538c05df15e5a21dd001ca5f25fb4f72f0af06b4bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7948 5220 bytes
font_01_sfnt_off00008b19.bin
86e0d9e5a99b3f144411eabd29aefcf6f42024f38c846df479d782198ca3c6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B19 10364 bytes

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