Malicious PDF — malware analysis report

Static analysis result for SHA-256 b029971d8f40e037…

MALICIOUS

PDF

34.9 KB Created: 2020-08-30 00:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7d44310d388a2a55f283eaf2f9a5394 SHA-1: 1d046a6eb1d26c48d2f62bd1e4156b99bbe8b264 SHA-256: b029971d8f40e037fa5141bdd4e46888711d697d4bcb820666f0d785f44babb5
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'New movies songs 2019 telugu free', likely a lure to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to a malicious site via a link within the PDF.

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.ru/wix?keyword=new+movies+songs+2019+telugu++free
    • https://static.usrfiles.com/ugd/4cf28d_67f57021eb6b4cd6b660d4cd2c8d813d.pdf
    • https://static.usrfiles.com/ugd/de65f7_2d412151aebe4c7eaae522020b594be7.pdf
    • https://static.usrfiles.com/ugd/b50c55_6d2d9a592d624d4daf377b61791c0555.pdf
    • https://static.usrfiles.com/ugd/912de2_304e6e7dc5c84154ab3c1c65815e865e.pdf
    • https://static.usrfiles.com/ugd/3eed2b_db304739504749b7b1a04bcb8af15d9a.pdf
    • https://static.usrfiles.com/ugd/36f25b_49d091ba9d004ef3b4b14928a30af4e7.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/irregular_verbs_worksheet_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/rejikok.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/56707041612.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/63473612277.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_off00004a44.bin
f71888919e10d288ad3390e0910b94458a7b39d24d182a4b81ad64fa10e2db79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A44 5480 bytes
font_01_sfnt_off00005d00.bin
15a76563c99f15905e4445e5092045a656285e0576e977be9366a20ca94db575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D00 9956 bytes

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