Malicious PDF — malware analysis report

Static analysis result for SHA-256 658ff0c7edf87bfc…

MALICIOUS

PDF

73.6 KB Created: 2020-08-14 00:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb34a302a6b3b080578b028626a14c6b SHA-1: f435a2fd9fcbd05c9fe5ebe2a6d5f48035c3fc7d SHA-256: 658ff0c7edf87bfc21f7044a12a64af4a606c55619dc4b9ef0a1719182956167
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for delivering malicious payloads or phishing pages. The document body, though heavily obfuscated, contains text suggesting a lure related to legal documents, and the heuristic firings confirm the presence of malicious redirector links and a link farm. No scripts were extracted from this sample, but the embedded URL is the primary indicator of malicious intent.

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=chargesheet+under+section+173+crpc+pdf
    • http://files.kmstudioart.com/uploads/1/3/0/9/130969183/9188029.pdf
    • http://files.scrollrefrigeration.com/uploads/1/3/1/3/131382590/5746523.pdf
    • http://files.grayden.info/uploads/1/3/1/3/131379085/somobog-goxalex-kuwipon-nunudumijopele.pdf
    • http://xevudo.thescarabexperiment.org/uploads/1/3/1/4/131407089/fominef.pdf
    • http://digige.alzeen.com/uploads/1/3/0/9/130969204/figapevepatagovuza.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/lelozogomoxazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/25890776316.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/fosuzaruxozinidubog.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/pulse_secure_vpn_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/45388366577.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2518/files/60262314541.pdf
    • https://cdn.shopify.com/s/files/1/0441/1149/5320/files/23777201530.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/86604224695.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/radegawej.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/geguzatez.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/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000cfac.bin
15b168a56f787489ac0911f6c6a3f417de9821d10d5d58d0a98a561aa5f569b3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCFAC 12788 bytes
font_00_sfnt_off0000bcac.bin
bc92bf26198c6e7a090cbcaa15258e7fea4feb22a578b58bb4f3a7353d57d39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 5584 bytes
font_02_sfnt_off0000f3b4.bin
8f5a9b5e54d8b54d0569c3a637323267981722c9dd61c5170dd7a0c3ce8e04f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 11388 bytes

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