Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53cdcaa47459a2a…

MALICIOUS

PDF

45.6 KB Created: 2020-09-03 05:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7219ab715b6101ca2d1b9a0f5ce1b68 SHA-1: dca27932351834f140f267cce8aff0aceba68080 SHA-256: b53cdcaa47459a2a9dcef37fe5fd6811b0bba74a94963bcbb3d31a27d92ab673
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs, with one pointing to a known malicious redirector (ttraff.me). The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious links broadly. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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.me/wix?keyword=english+learning+podcast
    • https://static.usrfiles.com/ugd/23924c_066dc54a9499483cb93f3970b9bd613e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c7dd89e9dab43968eb089672b0031c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5428e0bdcff242df9558c1964139c32d.pdf
    • https://static.usrfiles.com/ugd/a31856_c7f817d4ce8a427f8c8461e56da97aa6.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_d51cd46778814f1691e3f0ca1b1a49bc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0433/9551/4535/files/o_cavaleiro_das_trevas_hq.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bd0e40eb6e04721a88f651f4d4435b1.pdf
    • https://static.usrfiles.com/ugd/a1fb72_5e4e5f268bea4eadb0735810456919aa.pdf
    • https://static.usrfiles.com/ugd/8ade13_4b4d013e3dab49d291070801f93f7334.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8171/files/pubadilujafuga.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/poveguganolizoruwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7461/files/pefesedopibawoduzog.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/petojomelidadu.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_off00007573.bin
7486241134c59c570e3aa3fcab279f2395dee816396784e3093a03824f66cf1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7573 5292 bytes
font_01_sfnt_off00008770.bin
a80aa9351b3611387cc5e2975248e6ceeab12d8aad67231374f91da04f41fcd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8770 9980 bytes