PDF malware analysis — malicious · 545fff25adda2eb9

MALICIOUS

PDF

39.1 KB Created: 2020-09-01 04:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 93750d41630e6368f436aff2960bc4dc SHA-1: c3f173424f71effded9c61823062f87ff8073bfe SHA-256: 545fff25adda2eb910aae6a52ed06da5eb719c8ccaa71d6c2492c4a04fef53f4

128 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading the 'Shopee sg app apk'. The presence of numerous PDF links, many pointing to static.usrfiles.com, suggests a link farm designed to obscure the ultimate destination. The heuristic firings confirm the malicious redirector and the link farm, and indicate a fake invoice or payment lure.

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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/wix?keyword=shopee+sg+app+apk
- https://static.usrfiles.com/ugd/b8c837_fd44c88ae4f14a7290df5eebe60b285e.pdf
- https://static.usrfiles.com/ugd/c1615c_dcb83760d1034faca74db3b566fdaecb.pdf
- https://static.usrfiles.com/ugd/afe78f_6e716ac2a16e48449f7560a082e2a6f1.pdf
- https://static.usrfiles.com/ugd/b8c837_324eabb27b67418593593c50426704ce.pdf
- https://static.usrfiles.com/ugd/7baf93_985a3de99f7d4e00a034b9472eddbfdd.pdf
- https://static.usrfiles.com/ugd/6908d7_e98b9980a58742a6a7816cce2f7365d8.pdf
- https://static.usrfiles.com/ugd/73c254_e541b05a27064cf6ac0960a126ea3ce8.pdf
- https://static.usrfiles.com/ugd/50c35f_b6c58e7f998149f28e559656240b2c0d.pdf
- https://static.usrfiles.com/ugd/18122d_3874d4994c3f4e88913fbf83e5468db1.pdf
- https://static.usrfiles.com/ugd/b8c837_f71b5057ffa44e138626de63a8734e41.pdf
- https://cdn.shopify.com/s/files/1/0452/3291/4592/files/drug_antidotes.pdf
- https://cdn.shopify.com/s/files/1/0461/7076/7512/files/khatrimaza_bollywood_2018_movie.pdf
- https://cdn.shopify.com/s/files/1/0437/2103/1832/files/back_bonding_concept.pdf
- https://static.usrfiles.com/ugd/de65f7_03817a6d8701422889a2d118eadd5841.pdf
- https://static.usrfiles.com/ugd/3bf302_a3273bcd4c9e4ffca85901c1a5bca490.pdf
- https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.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_off000058f7.bin` `6236a5ef9f6090f8b7396460f383885eb0ac1e285cb0169f7e492f1a683a5c88`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x58F7	5120 bytes
`font_01_sfnt_off00006a62.bin` `f50959b2e7abe096bc55ee381115295161844cc7967ad6b8e529bc9f169644e2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A62	10912 bytes

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