Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7fe477decaf34d…

MALICIOUS

PDF

45.3 KB Created: 2020-09-19 14:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191c219aa7fafff85936fb2a669280c4 SHA-1: e434959079e393038fa5d836914a70154f699afd SHA-256: 7c7fe477decaf34d5cacf54f7efe5006ea0036b29dc39d919e5aea65b79e56e0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including a redirector link to 'ttraff.link'. This indicates a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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.link/wix?keyword=web+english+teachers
    • http://files.mwhsolutions.org/uploads/1/3/1/4/131409244/349957.pdf
    • http://molodu.kenova.org/uploads/1/3/1/4/131407406/gikofuvofixufun.pdf
    • http://gamituver.divaandmeproductionsinc.org/uploads/1/3/1/3/131383646/8906803.pdf
    • https://1c732f40-f363-4d74-b0b1-a09beb9ec592.filesusr.com/ugd/735189_a894b7625106469db9f5fd95bfb52245.pdf?index=true
    • https://02e6b3b0-7fdd-4420-95e3-c1e8daabd8b9.filesusr.com/ugd/2b3f46_cf12bcd0e22945428e664c7447f824ef.pdf?index=true
    • https://18a95b4e-41d1-4850-9381-bb22fdee99c4.filesusr.com/ugd/0aab01_24240d3cc0c54ad59f93a585621004eb.pdf?index=true
    • https://5eb44deb-d74b-4938-9377-acc2836cee73.filesusr.com/ugd/5be868_feb8ba95a9af489c973f24085e464097.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/jikebekagifaporimof.pdf
    • https://cdn.shopify.com/s/files/1/0432/1493/0084/files/ejercicios_asientos_contables_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/call_best_buy_niles_ohio.pdf
    • https://3e673bf8-7ba8-4e79-b898-d50d8b4e0fda.filesusr.com/ugd/c068f8_1c14858d43114bb6ab76045bd273e38c.pdf?index=true
    • https://65a2bb65-3c71-4885-a296-37f9233e78c5.filesusr.com/ugd/02beb7_4a6eb3457e404ab087faac269a984ccd.pdf?index=true
    • https://0a7ef371-902b-4a7f-bd6f-a523f8c0a126.filesusr.com/ugd/0286dd_ff64943725c84e17a1fc241ef234c20d.pdf?index=true
    • 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_off00007283.bin
df33e72449a21999edeb128e49c3a5faea8e92a6da5ba53f8f922aa16d7106ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7283 5216 bytes
font_01_sfnt_off00008451.bin
f8842c53990c20ea679945cb92f79357013c3f2caf628265dde58c1eb6d92dba
pdf-font-stream PDF embedded font (sfnt) at offset 0x8451 10692 bytes