Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd52d2746d3e547…

MALICIOUS

PDF

34.0 KB Created: 2020-08-24 18:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c912ba6373acc9728b640e8f250eb3e5 SHA-1: 23d7aa104c2db863039762bfe7445653de613ea4 SHA-256: edd52d2746d3e547137dfe87215dcc300a2f5aa1dcd494373f2fa5154c2f6dd0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic identifying it as a link farm pointing to a redirector. The primary malicious URL, https://ttraff.com/pify?keyword=bhaiya+mera+dulha+raja+song, is likely used to obscure the ultimate destination of the attack. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable, so the rationale is based on the link structure and heuristics.

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.com/pify?keyword=bhaiya+mera+dulha+raja+song
    • http://files.citramesinsby.net/uploads/1/3/0/7/130740536/f3c051.pdf
    • http://segij.blindsail.com/uploads/1/3/2/6/132682883/b1b3fb04a1a8876.pdf
    • http://files.spiritofsaron.com/uploads/1/3/2/3/132303170/rununetilaku-rolinisuxepezop-kukuzora.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/communication_barrier_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/53489891550.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/the_rangers_shake_that_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/fofunazuzute.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/savajojibivuzaje.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/angle_pair_relationships_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6124/files/revifabolovokolulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6032/9637/files/laritem.pdf
    • https://cdn.shopify.com/s/files/1/0434/0088/8483/files/99651197468.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/59043807986.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0498/files/16210816921.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_off000044aa.bin
b0f53332a9a4952d0e8112e87044d01dec6e9138933702a07254aae8f83a9fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x44AA 5468 bytes
font_01_sfnt_off00005725.bin
d6d19dc100181d9680592da5717a5b3e591500e1873fdfccc7049f2ed014881a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5725 11248 bytes