PDF malware analysis — malicious · d9ffc1e516278308

MALICIOUS

PDF

42.7 KB Created: 2020-09-02 19:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dbd013b994a5b3557a354952e9706fe9 SHA-1: 03a8d54a48d6a6c2aa5585677811b7144526981e SHA-256: d9ffc1e5162783087f8a4e368e0b379825de1e3f884c17a4570331c9a2406f6f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to appear as a worksheet with answers, but the primary link redirects to malicious infrastructure. The document body, though heavily obfuscated, contains the target URL and references to other PDFs, indicating a social engineering lure to drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict.

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.link/wix?keyword=permutations+combinations+and+probability+worksheet+answers
- https://static.usrfiles.com/ugd/7f929b_de429cd60ce0461e972dd9e4721c558e.pdf
- https://static.usrfiles.com/ugd/b8c837_1516538660044be79637c72da6bec997.pdf
- https://static.usrfiles.com/ugd/77eba6_a52961b3322541f1a65ca2dbd452c813.pdf
- https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
- https://static.usrfiles.com/ugd/b8c837_51b0f10196fc49fb995db2fd324f2de6.pdf
- https://static.usrfiles.com/ugd/4b7290_65869dd89c3d406e9bbbeb4595c71156.pdf
- https://cdn.shopify.com/s/files/1/0433/4750/9416/files/62110548023.pdf
- https://cdn.shopify.com/s/files/1/0430/6511/4775/files/gumodapase.pdf
- https://cdn.shopify.com/s/files/1/0432/4674/7803/files/5129227508.pdf
- https://cdn.shopify.com/s/files/1/0428/3308/4575/files/4622688052.pdf
- https://cdn.shopify.com/s/files/1/0433/6749/7880/files/81759178935.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
- https://cdn.shopify.com/s/files/1/0432/8429/9934/files/amoeba_sisters_mitosis_answer_sheet.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00005cfd.bin` `dab834afcfcb1e2da07704c8cbfdeb6c87149e64e2b72330e06d67b4fa4f9470`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CFD	5712 bytes
`font_01_sfnt_off0000704c.bin` `deed3f214d437d06de01624070e58a4f4acd7881f5e3e15809c4508f15ac5583`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x704C	14280 bytes

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