Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cac779d5b26f7b…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 20:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f255390892cac4cc424c4fe5baa023b6 SHA-1: 0367408dfc673ef16003d262c451ac08cf9e892e SHA-256: 32cac779d5b26f7b3046a6e29a97e7ae3b34c20338c473d873629e0e148d93c4
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with a popular search term to entice clicks. The ML classifier strongly indicated maliciousness, and the PDF was flagged for containing a mass external PDF link farm. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.cc/wix?keyword=shawn+mendes+mp3
    • https://static.usrfiles.com/ugd/b8c837_cebfd4218f284c44a4ef5ce093e729b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7e2ac6b38044181aedb1d95bd66ee17.pdf
    • https://static.usrfiles.com/ugd/7198c1_270ff7c4eea84fadb69e41f04dbea037.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd358eb5139245329059b49ec75e6d3d.pdf
    • https://static.usrfiles.com/ugd/0b46e6_2e520731d3e046d18d2e9ef98e5747bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_66ffbac10baa43a1afe90f3009dc55b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e1b765ff71455fa2a41edc4610bdfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee72262d63474f8fb77f4387ba36a8f1.pdf
    • https://static.usrfiles.com/ugd/ecec20_6a067ac9980b42179b924fa345a2fde1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d41640d3c184fca8f35edf71921ecee.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f045f1f5c8348eeb9a5d24a90b7582d.pdf
    • https://static.usrfiles.com/ugd/a382ee_3b496a1beef744b18fff6ed4fd9b9542.pdf
    • https://static.usrfiles.com/ugd/41a0b6_067bf7a94af248c6bb1be9c1bf0e73a9.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_off00005514.bin
f6b7c088c10bd487df025ada5dbf20e97af2fd892a95440fc709d76c1e610a11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5514 5432 bytes
font_01_sfnt_off00006776.bin
c0a19c4121c890b5e82d6e7c35d5681be60429bbac6e9ceb43531f213c050283
pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 15244 bytes
font_02_sfnt_off00009641.bin
9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9641 16060 bytes