Malicious PDF — malware analysis report

Static analysis result for SHA-256 85db36b7865a20a4…

MALICIOUS

PDF

48.4 KB Created: 2020-08-10 23:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3f214da9f167fc5780a7fb543a2c13 SHA-1: 16f9a64edd5600dd681b8742810b5b8edcc6ec02 SHA-256: 85db36b7865a20a466e3d6561a632eb595e0cbf432657fe2d99be8e721042ac1
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 domains associated with link farms and redirectors, such as ttraff.com. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are likely intended to redirect users to malicious content or phishing sites.

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=sargam+alankar+in+english+pdf
    • http://wamupe.gtvip.co/uploads/1/3/0/9/130969060/vasojawajep.pdf
    • http://files.epbemployeehealthcenter.com/uploads/1/3/1/4/131438604/5060935.pdf
    • http://files.ladyfifteen.com/uploads/1/3/1/4/131454221/1933852.pdf
    • http://files.lmmsorchestra.com/uploads/1/3/2/7/132740337/d989b74c8c.pdf
    • http://fewegaz.homemaintainers.com/uploads/1/3/0/8/130814017/f3ab2f7a.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/xebufamawud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/denadarupekawimuwakodi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/lujodigenasa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/vadap.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/luis_borges_el_aleph.pdf
    • https://cdn.shopify.com/s/files/1/0431/9071/4532/files/dowuvegokiwebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/55654514011.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6151/files/wipijofevalowoxibinob.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2089/files/kujugizurepalupokovipes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/apsale_net_click_115667_9571_art.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/lugesuporil.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_off00007f0a.bin
85359353ff95745194ec8112bcd08af9c7492a71a3b221bc9df5238e45029dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0A 5620 bytes
font_01_sfnt_off000091f2.bin
c77623cf5010d088e2f5b23bc7b2e7bc7820e65dc56deccea8553db5b324f982
pdf-font-stream PDF embedded font (sfnt) at offset 0x91F2 10312 bytes