Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e679dfc955d59bd…

MALICIOUS

PDF

46.6 KB Created: 2020-08-08 01:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb00b36d1d8d33ee9e75bb41c5d219ee SHA-1: af3a0371a33d356c20580a9c3316c20008e5d613 SHA-256: 3e679dfc955d59bd45073acd0c10f61bdb431a9b7118e80684de0dd54fa73d0d
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, many pointing to Shopify domains, which is characteristic of a link farm designed to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=apcrbc140+datasheet+pdf`. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains text that appears to be a lure related to a datasheet.

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.cc/pify?keyword=apcrbc140+datasheet+pdf
    • http://files.faithchapelberlin.com/uploads/1/3/1/3/131381607/pewibi.pdf
    • http://files.optimusalgarve.com/uploads/1/3/1/6/131606968/9902001.pdf
    • http://files.carpetcleaningsummerland.com/uploads/1/3/1/3/131383657/9684649.pdf
    • http://files.treasureu.net/uploads/1/3/2/7/132741194/4439739.pdf
    • https://cdn.shopify.com/s/files/1/0440/3966/7877/files/kuxumudefanumosamiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/vugarobafisudog.pdf
    • https://cdn.shopify.com/s/files/1/0440/9150/6840/files/jiroditirodubi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/workforce_planning_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/73312757912.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8021/files/rirozevugabatipixulor.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/tujukotixisakikami.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/binomial_distribution_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/79380772869.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/fezijunokipopunida.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depusulolunifanilux.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/gojipoxakuxojafonas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.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_off000069a7.bin
10385722f7cf9bed1e60c6fc8b376e3fe1423f4405e1f30fb620b86619be3c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A7 5624 bytes
font_01_sfnt_off00007cc1.bin
826f30d3a923346ab5424ae339d1aa1b3b4ab1fe2db480e9bb3054bdab3a5962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 16136 bytes

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