Malicious PDF — malware analysis report

Static analysis result for SHA-256 c561ce1174f88e77…

MALICIOUS

PDF

45.9 KB Created: 2020-08-11 14:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c2656660efb4d84ed231c8cb7fc600d SHA-1: 5afc7504d8d9b343b79bb2ffbba5d791870fb164 SHA-256: c561ce1174f88e77d8fdb3fa45f8b81af262272a179b24a6348587fee4d994de
152 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.com/pify?keyword=article+worksheet+with+answers+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which are hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same lure text and the primary malicious URL, suggesting the intent is to trick users into clicking the link for a fake "article worksheet with answers". No scripts were extracted from this sample.

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=article+worksheet+with+answers+pdf
    • http://pufij.michaels-photography.net/uploads/1/3/0/7/130738531/sopuxomag.pdf
    • http://files.stmatthewsbaptistchurch.com/uploads/1/3/2/6/132682681/80e49b.pdf
    • http://files.futures-in-motion.com/uploads/1/3/1/8/131872048/lefitaleje.pdf
    • http://files.soniasart.com/uploads/1/3/0/7/130776208/3d48d75d598dd.pdf
    • http://files.glacierviewfiredept.com/uploads/1/3/0/7/130740177/ad58f.pdf
    • https://cdn.shopify.com/s/files/1/0432/1653/5720/files/florida_sales_tax_form_dr-_15ez.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/vifiwowekevevojepoture.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9703/files/23709024503.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/senanu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/9592863417.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/torupepojorakiradetutawut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4684/files/sudajusulujawomesali.pdf
    • https://cdn.shopify.com/s/files/1/0450/4797/1990/files/adobe_maker_excel_add_in.pdf
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/kinakuneponizademo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/mewaxenudupagiro.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/51378932123.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/muxojana.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/80548303458.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_off00006820.bin
238a7c80a24e74a1c07600037d0c8bfd11ffe72a2531a8de65c5092bf2388349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 5176 bytes
font_01_sfnt_off000079b2.bin
028bf9ad4020c5cecd37e0f829e01335c1243637ca74b4638fcd5e549f7def8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B2 10144 bytes
font_02_sfnt_off00009c7f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7F 4324 bytes

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