Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a90bbc5d45f04ff…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 14:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f13979476892eba7f92d51070f275643 SHA-1: e4c855199607d10029dc21e12316fb0529eb8379 SHA-256: 6a90bbc5d45f04ff960eb67ef16468ee5ecb459dffb9dfb3c63e7890706627fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference website design topics, likely as a lure. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to create a link farm or distribute malicious content through seemingly legitimate platforms.

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=html+and+css+code+for+website+design+pdf
    • http://files.welcomehomeuk.com/uploads/1/3/1/3/131397971/tawunot_mibutunitapefo.pdf
    • http://files.thevictoriafreehouse.com/uploads/1/3/1/4/131407459/kanetuberadode.pdf
    • http://files.inrarefiedair.com/uploads/1/3/1/0/131071041/2272289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/48840458245.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/aggregate_crushing_value_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/deficiencia_de_vitamina_b2_en_aves.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/step_brothers_bloopers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/53552296452.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7404/files/25030192962.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/kissanime_garden_of_words.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/calculus_ii.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/ruxebubokerolujugub.pdf
    • https://cdn.shopify.com/s/files/1/0430/5285/9543/files/82787035302.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/developing_skills_for_the_toefl_ibt_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/7824958707.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/ubuntu_to_png.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_off0000643f.bin
f6c0fd6b5c0ec1e50e031899e35f2bc528a0e8c7b2e26117ccbdf131dad6423c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 5456 bytes
font_01_sfnt_off000076b4.bin
4a35511ca98a951ce6ba7604b5e7d80b60cd7b319e22c7815594c91296bf47bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B4 11272 bytes
font_02_sfnt_off00009d33.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D33 4324 bytes

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