Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd7e4ab31b0e87e…

MALICIOUS

PDF

49.7 KB Created: 2020-08-12 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e029f1e08302c7407ec09020324433e SHA-1: 4de32a8ce5713aef23bf5a1b72f9f0bf3c691dc1 SHA-256: cbd7e4ab31b0e87e9ccce25ec5c1de02eed8e3b1153b96d2ae5bc43963d50293
152 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=beginners+grammar+exercises+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a social engineering attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=beginners+grammar+exercises+pdf
    • http://files.goodbless.us/uploads/1/3/2/8/132815123/sobibuneloxego.pdf
    • http://files.paulquinndistrict-amec.org/uploads/1/3/0/7/130775084/nonifowasokuzupelizi.pdf
    • http://laxabuwun.swa10.com/uploads/1/3/2/6/132696048/566031.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/java_programming_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/64660260032.pdf
    • https://cdn.shopify.com/s/files/1/0434/7854/8630/files/24322819754.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/65404689718.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/latex_matlab_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/1082/6146/files/difference_between_capitalism_and_communism.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8247/files/black_and_white_photography_a_basic_manual_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/kijiwelefenaxezurofobega.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/2675299558.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/93161684469.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/89752662009.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/sims_4_no_censor_mod.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/akihabara_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078eb.bin
7dd4b20e3afe5d763e1ec2fcafcd5a39be6a2d9b7560b2dbb58015e851e8facb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EB 5160 bytes
font_01_sfnt_off00008a58.bin
0019b7112ca37ea67830e0e0ced2fa5503ba5b80cf6de38bc46e227fc187e171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A58 9780 bytes
font_02_sfnt_off0000abd1.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABD1 4324 bytes

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