Malicious PDF — malware analysis report

Static analysis result for SHA-256 c648688f03178c52…

MALICIOUS

PDF

54.9 KB Created: 2020-08-02 03:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a51644eace35fbeccabae168358b3f SHA-1: ad7fa0de0560ac0250da69c3aa48a76ff08e5599 SHA-256: c648688f03178c525c2ce622c7febd5f74aa8b03c106f1b18e6fcc1f78bbcec5
160 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting an SEO manipulation or redirection attack. The embedded JavaScript stream and the ML classifier further support its malicious nature. The primary malicious IOC is the redirector URL, which likely leads to further 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=cydia+impactor+cpp+160
    • http://files.daisydogfood.com/uploads/1/3/2/7/132740413/fc06573258d6173.pdf
    • http://files.nationincorporated.com/uploads/1/3/0/8/130814868/989b4042bb6.pdf
    • http://files.ryandawalt.com/uploads/1/3/1/3/131398094/sosal_rabizitumelaf_fotadaju_pobotafofenupi.pdf
    • http://files.midatlanticdrn.com/uploads/1/3/1/4/131408581/defd41526a.pdf
    • http://files.bsdforms.org/uploads/1/3/1/4/131453486/gozuwoz_dojuporomu_sawud_safon.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/sikurifokevufipemepo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/64935558242.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/56091148374.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/mezuwaruw.pdf
    • https://cdn.shopify.com/s/files/1/0449/4534/2619/files/duo_therm_brisk_air.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/54498466869.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/muxuburuxef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/40209981180.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/53936023607.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/a_train_is_passing_through_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/36640856661.pdf
    • https://cdn.shopify.com/s/files/1/0437/9020/5090/files/79270451780.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_off0000988d.bin
955fa356d14d54a614c4aaffd98a4ceea72a68fa3b9508a3649683a851478c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x988D 5364 bytes
font_01_sfnt_off0000aabd.bin
aafa4399ece382333f954146023b2ae6ee5816a5ee344a00adb59682b8691ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAABD 10472 bytes

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