Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff54659885b8dcd…

MALICIOUS

PDF

49.1 KB Created: 2020-08-08 08:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c77fe0e3d37b3a043c9cb3abe3d74803 SHA-1: d291c2d1b3a2b957d38b97adbbc5ffeba4da9025 SHA-256: aff54659885b8dcd4dfc8ed7caf7e4f075e3fb080857d4e0a0461d00679e03fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One critical heuristic identified a link to a known malicious redirector, and another identified a mass external PDF link farm. The document body contains garbled text but includes the URL 'https://ttraff.cc/pify?keyword=the+beatles+help+sheet+music+pdf', which is also flagged as a malicious redirector. The primary purpose appears to be directing users to a link farm, potentially for SEO manipulation or to host further malicious content.

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=the+beatles+help+sheet+music+pdf
    • http://kesetidi.lifeofgraydon.com/uploads/1/3/1/4/131453541/bonomuvusi.pdf
    • http://files.wissamsouss.com/uploads/1/3/1/4/131452952/8017880.pdf
    • http://files.btozpublishing.com/uploads/1/3/0/7/130739470/4160668.pdf
    • http://jasotewe.cherylreed.net/uploads/1/3/1/0/131070109/dofiwaw_mokanelebegul_xutovoparam_kelinakujoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/23363284160.pdf
    • https://cdn.shopify.com/s/files/1/0429/5409/6806/files/kusagewebabiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1674/8188/files/foforupowumire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibuzos.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2634/files/bonobelad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budexojimomamuzarumedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3549/files/revajububuzewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/62452580423.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/adobe_maker.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/52453900819.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/gabimel.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_off000073e1.bin
6d6827f9214b52d48286b46d1a3be9dc579fa4189beaa70b46e602d73bb643e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 5052 bytes
font_01_sfnt_off00008512.bin
26b872760e5642791eee0236606fe86919b1f89b196025df19a5706ec639cbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8512 10552 bytes
font_02_sfnt_off0000a932.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA932 4324 bytes

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