Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f07b60449c9684…

MALICIOUS

PDF

70.5 KB Created: 2020-07-29 17:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1145a0dbed4a9c770951c4b898baedc SHA-1: fd972ed03b47845b3fa8b7bff4c03dd1cc98d21a SHA-256: 20f07b60449c9684a85e132ed672bed27661061449db0b1a3641d148e121495d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic, indicating it points to known malicious infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic fired, showing the document hosts numerous external links, many of which are likely part of a link farm. The primary malicious IOC is the redirector URL, which likely serves as a gateway 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/pify?keyword=morphological+abnormalities+of+red+blood+cells+pdf
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
    • http://files.asc3.org/uploads/1/3/0/9/130969435/823132.pdf
    • http://files.teachmeaboutautism.com/uploads/1/3/0/7/130739340/bb8774.pdf
    • http://files.wyndcharmsilkenwindhounds.com/uploads/1/3/2/8/132814611/saxisirovapelepave.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/nanosapusonipomesiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/dosukitej.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/28220501154.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/49369383278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/domamusuvusuzexi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/93973722015.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/6442005187.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/xiraxexafivulutulurapav.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/zoxixebut.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/5493170762.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/11766237.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_off0000d5e1.bin
e589c12eb52101210bdafe11f89b2eafbc0e8251be83b71e341f168ef7b19aba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 5504 bytes
font_01_sfnt_off0000e85c.bin
26999d9df9a15ff99e31b8108989c7d6447d37bdcbd2d8cfd0e97442d9f2c524
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10620 bytes