Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a1f898c6c0dc17…

MALICIOUS

PDF

46.1 KB Created: 2020-08-08 21:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47cb7f1a9bdfa1f5bf9c8af11b41343 SHA-1: 146b96fd487cf9d6119297ba0d56e7f06028650e SHA-256: d5a1f898c6c0dc1761d7d3e4de78706a5d1200f19b402367c60e16cddf4730ae
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 external resources, a technique often used for SEO poisoning or redirecting users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=pdf+to+editable+word+converter+online+free+without+email'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics confirm a link-based attack pattern.

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=pdf+to+editable+word+converter+online+free+without+email
    • http://files.foreverfork.com/uploads/1/3/0/7/130776714/f77efff777f5.pdf
    • http://files.burgfootball.com/uploads/1/3/0/8/130874162/0d53a.pdf
    • http://files.wiltshirebridlewaysassociation.co.uk/uploads/1/3/1/4/131453268/gebubibimikat.pdf
    • http://files.splendourproject.com/uploads/1/3/0/7/130740211/7e54eb1df37.pdf
    • http://files.ayurvedalifescience.com/uploads/1/3/0/8/130813781/11418.pdf
    • https://cdn.shopify.com/s/files/1/0441/1791/7848/files/muslim_bukhari_sharif_book_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/zorijepamifumexidoweb.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7383/files/l_alphabet_morse.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/gastrocnemius_strain_rehab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/89960823449.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/belode.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/55356642544.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6465/files/99568788950.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/45794063778.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/7037471346.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/carboxiterapia_estetica.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/buremadurizekotovafex.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_off00006745.bin
da1ffd2a0cd8096f6a7f59703a8984da52793a12d773a12b74b8c261eb368a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6745 5260 bytes
font_01_sfnt_off00007908.bin
6b7113d7f315768501cd17e29aa583c32952e2fa2a55725cb322fdcc3a7bfea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7908 10420 bytes
font_02_sfnt_off00009cb2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB2 4324 bytes

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