Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a41ec75c8ed6ba0…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 20:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d539012296b98a0b4d958bdbe93d4ae0 SHA-1: 343c9751df30049a1570e4baf85b0c8cd7c43193 SHA-256: 5a41ec75c8ed6ba09ef999b546fae1ef52c234d97f445fd0b234c806421c702b
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body text, though partially garbled, suggests a pretext for clicking the link, such as a printing issue. The heuristic firings confirm the presence of malicious redirector links and a large number of external PDF links, indicating a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=trying+to+print+pdf+booklet+but+pages+upside+down
    • http://files.friendsofmip.com/uploads/1/3/1/4/131438449/davosodaw-lubezej-gefita-xupumibo.pdf
    • http://files.peculiaritypress.com/uploads/1/3/2/8/132815755/jidoxuvowigese_romozixenugipi.pdf
    • http://files.wadslaw.com/uploads/1/3/0/8/130873715/f0d39fbb318c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/xagawefevobixagepos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/komutebabog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/85549004925.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/wepezisukimolenotoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/25947558501.pdf
    • https://cdn.shopify.com/s/files/1/0440/7505/7302/files/edwin_abbott_abbott_flatland.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/vozetakib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4647/files/86201522109.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://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005be5.bin
92c6bd61ead6dad4b2bc006c76c50fb7c2b3708bfe3c024adb532ec1f1c350da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 5556 bytes
font_01_sfnt_off00006ef5.bin
6b2eed58592470ded91ce08874b304ec00c872ee4b75937e67ebc36bacbb8ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF5 10308 bytes
font_02_sfnt_off0000921e.bin
f73eea4915bb44f6d1ad04c560f2fc00f59ead234c832a75a49506bd6212c62c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x921E 6464 bytes

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