Malicious PDF — malware analysis report

Static analysis result for SHA-256 273e0e9d106ab3eb…

MALICIOUS

PDF

39.9 KB Created: 2020-09-04 18:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f96699ab2cabc8914cbacec2515133 SHA-1: bfe4e4d6a24b6c1f6e372180aca530025f383494 SHA-256: 273e0e9d106ab3eb6181c90ce1b3609fe4deadeff449616ae803ba768453f4ec
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The presence of numerous external links, many hosted on Shopify, suggests a link farm or a method to obscure the final malicious destination. No scripts were extracted, but the primary malicious function appears to be redirecting the user to a harmful site.

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.club/pify?keyword=cocker+spaniel+clipping+guide
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/bepikibezufinases.pdf
    • https://cdn.shopify.com/s/files/1/0434/2025/4375/files/gebawovibifaneliv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/vusumixowuwasobimudole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/dijujenalodumiviwiz.pdf
    • https://static.usrfiles.com/ugd/432b07_8873201bcbb2444b9030702615203086.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/sg-2_nsf_stainless_steel_manual_can_opener.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9654/files/83805854255.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/coyote_and_the_buffalo_summary.pdf
    • https://cdn.shopify.com/s/files/1/0448/5667/2418/files/2006_volkswagen_jetta_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/buku_al_quran_dan_sains.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/56084594727.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_off00005f78.bin
d1e625226ef9a6e1c526fed0f8e945b8c2d140458759939998aa6ad6815b26f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F78 5212 bytes
font_01_sfnt_off0000713e.bin
ee2a9fe3a7d18ba62ada1fd2ab90fa43a05e66596b05b9fed5830889d60da00e
pdf-font-stream PDF embedded font (sfnt) at offset 0x713E 9968 bytes