Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd6e3574b7f9f62…

MALICIOUS

PDF

40.7 KB Created: 2020-08-02 06:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5797a51ac049b23144223f39e2982f1 SHA-1: b8eddf0c475926dd87982daa689a127e344cbc89 SHA-256: dcd6e3574b7f9f62c2b48eb0ee8ed6323c70506aebc0dab94524712c23134223
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, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated but contains the primary malicious URL, suggesting the document's purpose is to lure users to malicious sites. No scripts were extracted from this sample.

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=string+compression+java
    • http://files.eakahane.com/uploads/1/3/2/8/132815123/7774989.pdf
    • http://files.stunningsphynxkitten.com/uploads/1/3/1/4/131454523/4148937.pdf
    • http://files.alyssastanghellini.com/uploads/1/3/0/8/130874266/44b41a702baf0.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/vawunuziferemalalowez.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/zibiwofozigagem.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/wozogonozogogamed.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/63512454093.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/rigogajusaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5316/2394/files/bozufajavezukobi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/98886115477.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/66329483778.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/20652499137.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/tozizivojinamik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/9772557881.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/33408810130.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_off00005f7e.bin
edf7f197adc74db007d60b14263f35575771b8c933fbe9b5597109923b871a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7E 5460 bytes
font_01_sfnt_off0000720c.bin
6d05a261d097383e6cc5d9c410d198028798c637b7d43d8586ba909c64a7ec8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x720C 10552 bytes