Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b93e7610f28bbba…

MALICIOUS

PDF

44.0 KB Created: 2020-08-12 02:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a2535ac86df5cf6715dc94999a48976 SHA-1: 5144ccaa5a622840ed966d2790ec50e97bb73418 SHA-256: 8b93e7610f28bbba0d5ffd058a1c405cb79d28f37f3a9899bea0098cca522184
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, disguised as a Kia Soul owner's manual. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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/wb?keyword=kia%20soul%202010%20owners%20manual%20pdf
    • http://files.clinicsdirect.co.uk/uploads/1/3/1/8/131872055/dibekofasi-lubatelovaduto-xukow.pdf
    • http://files.barbarablumenthalehrlich.com/uploads/1/3/0/7/130738914/fiburoritigele.pdf
    • http://files.collegefootballtoday.org/uploads/1/3/2/7/132740501/9899ec0.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/gtx_660_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5938/8316/files/robotic_arm_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/no_mans_sky_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/wenonopigeludulawasawuri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0605/7883/files/94127573579.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/http_members_bangbros_com_login.pdf
    • https://cdn.shopify.com/s/files/1/0449/8325/5198/files/cinderella_short_story.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/nilefivijivazudolosekofok.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/second_law_of_thermodynamics_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/75114937183.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_off0000603b.bin
96e68f6bf44d51dcfe2ff13c9d3c7f3b11e4452ed0913b8ce1cc5555acdae5f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603B 5376 bytes
font_01_sfnt_off00007276.bin
5701f9925f03653041b2e6255e51d3e7a924dd66a54d15c76861568edec86301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 10192 bytes
font_02_sfnt_off00009566.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9566 4324 bytes

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