Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd4bf6d30be1147…

MALICIOUS

PDF

39.6 KB Created: 2020-08-26 10:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 345b1c43ef65a3d22b99b7f9c113588e SHA-1: cb6933ba6d24d43a723ed67343b77b57b3b7ef31 SHA-256: 4cd4bf6d30be11472333c9cd6f67adaf531817d7d8fec941e876e6afd72ed164
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 ttraff.ru. This infrastructure is known for redirecting users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is designed to lure users into clicking malicious links.

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=present+simple+past+simple+passive+v
    • http://bawam.shopblingcandyboutique.com/uploads/1/3/0/8/130813528/mubigiresoneruk.pdf
    • http://files.amandaolsondpt.com/uploads/1/3/2/7/132740580/7507328.pdf
    • http://jogadesot.benformisano.com/uploads/1/3/1/6/131637376/motekefagubogir-fubabev-nuwibimuzon-xanibizabogude.pdf
    • http://tekuwu.richardmongiat.com/uploads/1/3/1/8/131871390/ac9c2f.pdf
    • http://xinamoj.kansasnursingstudents.org/uploads/1/3/1/6/131636725/fesirir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/66477856756.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/wapukozalajexugagisexu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/escala_cromatica_colores.pdf
    • https://cdn.shopify.com/s/files/1/0464/6889/0782/files/94338241133.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/42315617421.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/pdf_to_image_java.pdf
    • https://cdn.shopify.com/s/files/1/0438/3640/7973/files/76650972999.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/xinuleveduxilidokato.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/gospel_of_barnabas_free_download.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_off00005e37.bin
354a27c085a5572eb7df69f2d4436953a0db8758d81c5d51454bed32946a214f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 5024 bytes
font_01_sfnt_off00006f33.bin
0e8c170acd3af1a3923d0bb0fe9657fca0ef0feca582122053fadb0693351a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 10060 bytes