Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df313004748e383…

MALICIOUS

PDF

43.6 KB Created: 2020-08-02 02:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5eeba5c68d9d3bee20256e49fceb682 SHA-1: 9c953cd3c292591fd0fb38be64dcad1a43256309 SHA-256: 1df313004748e3839857b5c791077a95c9e6914bf76ed9f1565100926b7b3d98
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a download for Windows 10 on Mac. This is further supported by heuristics indicating a malicious redirector link and a link farm, suggesting a phishing or malware distribution attempt. The document body text explicitly mentions the lure and the malicious URL, reinforcing the attack pattern.

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/pify?keyword=download+window+10+for+mac
    • http://files.benbernous.com/uploads/1/3/2/8/132815343/bijewe.pdf
    • http://files.fourcornersveterinarysymposium.com/uploads/1/3/0/7/130740178/mefosebote.pdf
    • http://files.wingsofmercyart.com/uploads/1/3/1/0/131070231/1ce630ae6bc8ad1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/rekidotanuwavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/84724966887.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/13320051949.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/28951709987.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0426/files/49719971973.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/reinstall_quickbooks_converter.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/jusebibixarimuju.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/gejudofupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/ruzoboguw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuzodatusowajukekef.pdf
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/feriwawox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/92404585857.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/73042441024.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_off00006ca5.bin
bf8404a80e6f2dda595b72d87be6c6f74f1fc27e2856570b5d7e148106bf3cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 5276 bytes
font_01_sfnt_off00007ea1.bin
374da54bb61ed1e319b3ea958bbd584492da36e21718e5d256102aca324dc952
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 10036 bytes