Malicious PDF — malware analysis report

Static analysis result for SHA-256 7592a9274455eeae…

MALICIOUS

PDF

45.1 KB Created: 2020-08-10 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b0ff6fe42854d8f09e4a24547f5c55e SHA-1: ab5ec6d4c710be529add6e3526d6df170bd75385 SHA-256: 7592a9274455eeae0c3c6f5023b8a204dfca339e7cfb5ee33ee11630106dd885
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 external PDF files hosted on various domains. One of these links, 'https://ttraff.ru/pify?keyword=cuales+son+los+valores+de+la+ciudadania+digital+pdf', is identified as a known malicious redirector. This suggests the document is part of a link farm or SEO spam campaign designed to drive traffic to malicious 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.ru/pify?keyword=cuales+son+los+valores+de+la+ciudadania+digital+pdf
    • http://jubet.brunyislandseafood.net/uploads/1/3/1/4/131482995/205a53f8034ae.pdf
    • http://files.quasilocum.com/uploads/1/3/1/3/131380733/dazepip-tefifipipewesex.pdf
    • http://files.plantsandponytails.com/uploads/1/3/1/4/131437657/9962222.pdf
    • http://files.rebeccagrayyoga.com/uploads/1/3/0/8/130874238/bdc71a461.pdf
    • http://lifuzo.thesummitplayhouse.org/uploads/1/3/0/7/130776791/cb7cca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/pujugexomarirazaz.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/about_behaviorism_b_f_skinner.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/widodazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/fipamamej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/hey_soul_sister_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/4438896869.pdf
    • https://cdn.shopify.com/s/files/1/0429/4803/4716/files/30630070056.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/add_artboard_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/46627691127.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/555_astable_multivibrator.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/vumepetotokolowoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/82032160532.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0167/files/44862080313.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_off00006ed6.bin
2223e4b4e3055e48a510e00d15007e38d6c637ddcf268753a5107f6263eb137c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 5288 bytes
font_01_sfnt_off000080ea.bin
344b96cd5a9d7b406858be4903b01407f8a8aeb26399fe556ffaca4b4ef55c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EA 11024 bytes

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