Malicious PDF — malware analysis report

Static analysis result for SHA-256 08403a776ff5beb7…

MALICIOUS

PDF

46.7 KB Created: 2020-08-19 11:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddea4222f52537f2f8837d376f3a3675 SHA-1: 44046a924ab51c0ab2ebf4ca699fc0db9a0bb419 SHA-256: 08403a776ff5beb72252568c4716650b2218919d024dd4678b83a593467bf57c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to drive traffic to malicious sites.

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=a+name+mobile+wallpaper
    • http://files.positiveposturenz.com/uploads/1/3/1/4/131483550/sivaf_polatafi_zuwovil.pdf
    • http://files.mopswestchester.com/uploads/1/3/2/6/132695994/busutom.pdf
    • http://files.libertylol.com/uploads/1/3/1/6/131637409/11152.pdf
    • http://zezebano.crazy-cats-creations.com/uploads/1/3/1/8/131872155/8010025.pdf
    • http://riwaku.mackaystreetchaplaincy.com/uploads/1/3/0/7/130776068/maleb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/zodavabiluja.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/76429791654.pdf
    • https://cdn.shopify.com/s/files/1/0448/8983/3639/files/difference_between_one_way_and_two_way_anova.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/10002208126.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/35212560258.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/jio_cinema_apk_for_sony_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/serigedujixuwiloxewibibim.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6726/files/free_viber_apk_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/meaning_and_definition_of_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0438/7209/2315/files/lulipovevodonetodug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/xifesefevul.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/zelelizum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/vigurezujezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/salesforce_administrator_resume.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005208.bin
c9fc606026e8b6f6e0eff6b1997e9c148acb198431979d563b5d537f8567ceba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5208 12472 bytes
font_01_sfnt_off00007a6a.bin
cc6d6d8c5b961c3a1176300ed82a61e692983826d9888ec955402829fb3f8689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 5008 bytes
font_02_sfnt_off00008b64.bin
c8e728e64e34e568a7ff317d7ac6173036dcf8151cf4c210ceeadb6126106997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B64 9992 bytes

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