Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fe7111a4657515…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 00:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81a0b2999a6bf1c6940f82de91202d8 SHA-1: bdd0766be23a9d8de888ef3f8347ab510fc6b2bb SHA-256: f8fe7111a4657515508028ef3830a0e9507b172940fca7d65013c17a4d1d14ad
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a significant portion pointing to a link farm hosted on cdn.shopify.com and redirecting through ttraff.ru. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that ttraff.ru is known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=movie+box+for+macbook, suggesting a lure related to software. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=movie+box+for+macbook
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://files.stage2screen.com.au/uploads/1/3/0/7/130775668/1084cc8fbe8d60.pdf
    • http://files.cheesemaegden.com/uploads/1/3/0/9/130969312/baremisanemajesuja.pdf
    • http://files.anahataretreataustralia.com/uploads/1/3/1/1/131164442/d4721b545b808f3.pdf
    • http://files.tarawattdesign.com/uploads/1/3/1/6/131606758/zavuf_kudikexevozag_vuzifowak_nevirobujatole.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/release_of_lien_form_texas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/dofuso.pdf
    • https://cdn.shopify.com/s/files/1/0438/5066/2053/files/rifimox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/xusebopume.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/popepovexesofogipevagosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4437/files/12371080143.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2804/files/70590240799.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/68807367162.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/rapofobetaxadiforil.pdf
    • https://cdn.shopify.com/s/files/1/0450/4561/2694/files/story_books_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/lebimiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/5137/7049/files/fijavuvawifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/7584036285.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4332/files/kunufakulobakasovosoduxot.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/
    • https://cdn.shopify.com/s/files/1/0432/6955/4332/files/kunufaku

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f0.bin
3208ea1fd44cf1e54d5be59744b986512b53926e81e939690e0f5c03fa5e0c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 5152 bytes
font_01_sfnt_off0000757b.bin
0ebcfb3a18aae5f33901bebff7c34521c4bebeda8714043e639dbaa36dffd802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 10592 bytes

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