Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8134f73d3021389…

MALICIOUS

PDF

43.6 KB Created: 2020-08-18 15:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a53f137aaeb94bb0abf7d23750889b SHA-1: 221b34edb2947d8f6099e54c5467070b3819d604 SHA-256: e8134f73d3021389f803a35432e9707300cb3bdc3ba81530bcff5ad33ce75a34
152 Risk Score

Malware Insights

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

The PDF contains a deceptive lure related to 'Prentice hall chemistry lab book answers' and embeds multiple external links. One of these links, 'https://ttraff.cc/pify?keyword=prentice+hall+chemistry+lab+book+answers', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body itself is heavily obfuscated but contains the lure text and the malicious URL.

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=prentice+hall+chemistry+lab+book+answers
    • http://files.samniquekahalsey.com/uploads/1/3/0/9/130969448/ae40cffb.pdf
    • http://kajatif.kingsroofing.net/uploads/1/3/1/8/131871980/lobedinoli-rumolasekumi-nalofula.pdf
    • http://files.bsswa.org/uploads/1/3/0/9/130969939/zorituduxasam.pdf
    • http://kumupupi.lyndatongue.com/uploads/1/3/0/9/130969439/nirezizetagupisabi.pdf
    • http://files.searlneuropsychology.com/uploads/1/3/1/4/131437845/xisizulakin_kadixalufonaf_zuzesego_suluruzujuve.pdf
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/71723435091.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/28053109852.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/vebudebelawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/naleperedoduk.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/brucella_oie_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/pares_emocionales_biomagnetismo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/21881618930.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/44705812790.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/jiwibavizuburesonexagobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/autonics_tk4s-_14rn_manual.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_off00006b39.bin
3b800c08f230eadfc56781705437ad13a9b1b980446daf9c40d8c6e1a94af357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 5436 bytes
font_01_sfnt_off00007d93.bin
d4192a4100e45c27dc1aaae1dec8c231dfc68f7e355abfa64b67bfdfb9e21271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D93 10552 bytes

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