Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b8d4bad7b19fb5…

MALICIOUS

PDF

48.4 KB Created: 2020-08-06 08:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdc549fcb6446352a1ffcff95c6aa178 SHA-1: c115e72953e7f6fa34411897297233431f120b6b SHA-256: d4b8d4bad7b19fb541f759506aa19ed94cb1984d4ebc5ab3fc7c688ab692b730
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 of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=types+of+amino+acids+and+their+functions+pdf, is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting the intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=types+of+amino+acids+and+their+functions+pdf
    • http://files.row4victory.com/uploads/1/3/1/3/131379042/loxitirugij-poredawudagama-lokajiwopip-sotusiloneku.pdf
    • http://gawofixej.lueveasdreamtoreality.com/uploads/1/3/1/4/131453194/tobodopud-nanivof.pdf
    • http://files.noamonn.com/uploads/1/3/1/4/131437615/4023781.pdf
    • http://files.creativedatainc.com/uploads/1/3/2/7/132741397/47ab34baff.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/79719674579.pdf
    • https://cdn.shopify.com/s/files/1/0448/3471/7858/files/makkar_ielts_speaking_cue_card_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0933/files/62487271561.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/xuzovadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/zosebemabatusejaruvuzat.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/cannon_power_shot_s2is.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/the_minute_hour.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/renew_texas_drivers_license.pdf
    • https://cdn.shopify.com/s/files/1/0434/3526/2104/files/mosusega.pdf
    • https://cdn.shopify.com/s/files/1/0431/6738/3712/files/10250697710.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/67700513545.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/4960347203.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e07.bin
d17c7057e51b5b29d896de5c4069bf437aacbbfa07af4d61efb2b66a303075bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E07 5416 bytes
font_01_sfnt_off0000904b.bin
8675b2bb75bc6f86204a147fb82753dafaed72a042a4d81ee229f477987c1b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904B 10016 bytes

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